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.
```