fix: avoid deprecation message of `abab` package

[alexander-akait]

This PR contains a:

• [x] bugfix
• [ ] new feature
• [ ] code refactor
• [ ] test update
• [ ] typo fix
• [x] metadata update

Motivation / Use-Case

fixes https://github.com/webpack-contrib/source-map-loader/pull/226 fixes https://github.com/webpack-contrib/source-map-loader/issues/225

Breaking Changes

No

Additional Info

We can't use built-in atob because we want to be error recovery in some cases

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (fdbdeab) 97.83% compared to head (e6e74bb) 98.02%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #228 +/- ## ========================================== + Coverage 97.83% 98.02% +0.19% ========================================== Files 5 5 Lines 323 355 +32 Branches 99 105 +6 ========================================== + Hits 316 348 +32 Misses 6 6 Partials 1 1 ```

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