Fixed a discrepancy in `OP_ASET`

There was a discrepancy in the actual behavior, assertions, and documentation.
Therefore, I modified it based on the actual behavior.

build(deps): bump github/super-linter from 4.8.3 to 4.8.4

Bumps [github/super-linter](https://github.com/github/super-linter) from 4.8.3 to 4.8.4.
- [Release notes](https://github.com/github/super-linter/releases)
- [Changelog](https://github.com/github/super-linter/blob/main/docs/release-process.md)
- [Commits](https://github.com/github/super-linter/compare/v4.8.3...v4.8.4)

---
updated-dependencies:
- dependency-name: github/super-linter
  dependency-type: direct:production
  update-type: version-update:semver-patch
...
Signed-off-by: dependabot[bot] <support@github.com>

build(deps): bump github/super-linter from 4.8.1 to 4.8.3

Bumps [github/super-linter](https://github.com/github/super-linter) from 4.8.1 to 4.8.3.
- [Release notes](https://github.com/github/super-linter/releases)
- [Changelog](https://github.com/github/super-linter/blob/main/docs/release-process.md)
- [Commits](https://github.com/github/super-linter/compare/v4.8.1...v4.8.3)

---
updated-dependencies:
- dependency-name: github/super-linter
  dependency-type: direct:production
  update-type: version-update:semver-patch
...
Signed-off-by: dependabot[bot] <support@github.com>

Run the task only once when `parse.y` is updated

Added `Random.#bytes` method

Added `Array#product` method

build(deps): bump actions/checkout from 2.3.5 to 2.4.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.3.5 to 2.4.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2.3.5...v2.4.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-minor
...
Signed-off-by: dependabot[bot] <support@github.com>

Improved `Class#new` method

Fix failed build with `MRB_NAN_BOXING` and `enable_cxx_abi`

For `MRB_NAN_BOXING` and `MRB_WORD_BOXING`.

ref: https://docs.ruby-lang.org/ja/3.0.0/method/Random/i/bytes.html

Ruby-1.9.0 feature.

ref: https://docs.ruby-lang.org/ja/3.0.0/method/Array/i/product.html

```console
% c++ -xc++ -std=c++03 -S -Iinclude -DMRB_NAN_BOXING -DMRB_NO_PRESYM -o- src/array.c > /dev/null
In file included from src/array.c:7:
In file included from include/mruby.h:115:
In file included from include/mruby/value.h:201:
include/mruby/boxing_nan.h:95:12: error: cannot initialize return object of type 'enum mrb_vtype' with an rvalue of type 'int'
    return (enum mrb_vtype)(o.u >> 8) & 0x1f;
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
```

Avoid redefining `MRB_WORDBOX_NO_FLOAT_TRUNCATE`

Avoid violations of the `mrb_static_assert()` standard

Integers out of 32 bit range will be allocated in the heap.

Favor pointer means encode NaN boxed values to keep pointer values
unmodified, to reduce the cost of far frequent pointer value retrievals.

ref: #5564

```console
% cc -pedantic -S -Iinclude -DMRB_NO_PRESYM -o- src/array.c > /dev/null
In file included from src/array.c:7:
In file included from include/mruby.h:115:
In file included from include/mruby/value.h:204:
include/mruby/boxing_word.h:133:1: warning: must specify at least one argument for '...' parameter of variadic macro [-Wgnu-zero-variadic-macro-arguments]
mrb_static_assert(sizeof(mrb_value) == sizeof(union mrb_value_));
^
include/mruby.h:109:108: note: expanded from macro 'mrb_static_assert'
    mrb_static_assert_expand(mrb_static_assert_selector(__VA_ARGS__, mrb_static_assert2, mrb_static_assert1)(__VA_ARGS__))
                                                                                                           ^
include/mruby.h:100:10: note: macro 'mrb_static_assert_selector' defined here
# define mrb_static_assert_selector(a, b, name, ...) name
         ^
1 warning generated.
```

Adding `MRB_WORDBOX_NO_FLOAT_TRUNCATE` to the build configuration in 32-bit CPU mode had a double definition.

```console
% cat myconf.rb
MRuby::Build.new do
  toolchain "clang"
  defines << "MRB_WORDBOX_NO_FLOAT_TRUNCATE"
  cc.flags << "-m32"
  linker.flags << "-m32"
  enable_debug
end

% rake CONFIG=myconf.rb
CPP   src/array.c -> build/host/src/array.pi
In file included from /var/tmp/mruby/src/array.c:7:
In file included from /var/tmp/mruby/include/mruby.h:115:
In file included from /var/tmp/mruby/include/mruby/value.h:203:
/var/tmp/mruby/include/mruby/boxing_word.h:11:10: warning:
      'MRB_WORDBOX_NO_FLOAT_TRUNCATE' macro redefined [-Wmacro-redefined]
# define MRB_WORDBOX_NO_FLOAT_TRUNCATE
         ^
<command line>:3:9: note: previous definition is here
#define MRB_WORDBOX_NO_FLOAT_TRUNCATE 1
        ^
1 warning generated.
...SNIP...
```

The number of registers used is reduced.

Also, previously `R6` and` R7` were used, which exceeded the limit of `new_irep.nregs = 6`.
This could cause the VM stack to overrun.

Preparation for:

* 64 bit integer with NaN Boxing
* Favor pointer NaN Boxing