Fixes keywords are lost with the `OP_SENDB`

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.

If a splat argument was passed, it could write out of range on the VM stack.

```console
% bin/mruby -e 'def m(*args, **opts, &blk) p [args, opts, blk] end; m(*%w(X Y Z), r: 1, g: 2, b: 3) {}'
[["X", "Y", "Z"], {}, #<Proc:0x80077d7d0>]
```

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.