Raise `TypeError` with `super` inside `instance_eval` / `class_eval`

Commit d0f60182 introduced an exception as a limitation of mruby.

Subsequent CRuby-2.7 has changed its behavior to raise an exception.
ref: https://github.com/ruby/ruby/commit/55b7ba368696033f2e89b77cbcd4a05dec97b139

* renamed from redundant `readint_mrb_int()`
* supports only base upto 16
* no base validation (already done in parser)
* no negative read (negate after read)
* overflow detection using `mrb_int_{mul,add}_overflow()`

Difference from `strtoul(3)`:

* reads `mrb_int` based on configuration
* specifies the end of the string
* no sign interpretation
* base 10 only

build(deps): bump github/super-linter from 4.2.1 to 4.2.2

Bumps [github/super-linter](https://github.com/github/super-linter) from 4.2.1 to 4.2.2.
- [Release notes](https://github.com/github/super-linter/releases)
- [Commits](https://github.com/github/super-linter/compare/v4.2.1...v4.2.2)

---
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>

The file provides `mrb_read_float()` renamed from `vim_strtod()`.

build(deps): bump github/super-linter from 4.2.0 to 4.2.1

Bumps [github/super-linter](https://github.com/github/super-linter) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/github/super-linter/releases)
- [Commits](https://github.com/github/super-linter/compare/v4.2.0...v4.2.1)

---
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 4.1.0 to 4.2.0

Bumps [github/super-linter](https://github.com/github/super-linter) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/github/super-linter/releases)
- [Commits](https://github.com/github/super-linter/compare/v4.1.0...v4.2.0)

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

* `mrb_cstr_to_inum()`
* `mrb_cstr_to_dbl()`

build(deps): bump github/super-linter from 4.0.2 to 4.1.0

Bumps [github/super-linter](https://github.com/github/super-linter) from 4.0.2 to 4.1.0.
- [Release notes](https://github.com/github/super-linter/releases)
- [Commits](https://github.com/github/super-linter/compare/v4.0.2...v4.1.0)

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

The code was contributed from Carson McDonald (@carsonmcdonald)