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)

Fix typo in `lib/mruby/presym.rb`

* refactor `mrb_integer_to_str()`
* refactor `mrb_str_format()`

build(deps): bump actions/cache from 2.1.5 to 2.1.6

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.5 to 2.1.6.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](https://github.com/actions/cache/compare/v2.1.5...v2.1.6)
Signed-off-by: dependabot[bot] <support@github.com>

So that `mruby -e 'a'` does not print backtrace history, i.e.

```
% mruby -e 'a'
-e:1: undefined method 'a' (NoMethodError)
```

Instead of

```
% mruby -e 'a'
trace (most recent call last):
        [1] -e:1
-e:1: undefined method 'a' (NoMethodError)
```

Method names need not to be printed in backtrace history.

Use only `mrb_ary_entry` hereafter.

build(deps): bump github/super-linter from 3.17.1 to 4.0.2

Bumps [github/super-linter](https://github.com/github/super-linter) from 3.17.1 to 4.0.2.
- [Release notes](https://github.com/github/super-linter/releases)
- [Commits](https://github.com/github/super-linter/compare/v3.17.1...v4.0.2)
Signed-off-by: dependabot[bot] <support@github.com>

Instead of using copyrighted `strtod`, now use the public domain
implementation of `strtod` by Yasuhiro Matsumoto (@mattn). The function
has been renamed to `mrb_float_read()`; ref #5460 as well.

Fix typo in `src/fmt_fp.c` [ci skip]

Too many digits to fit in single precision float numbers, so that tests
fail when `MRB_USE_FLOAT32` defined.