Build(deps-dev): bump the dev-dependencies group with 2 updates

Bumps the dev-dependencies group with 2 updates: [nette/tester](https://github.com/nette/tester) and [slevomat/coding-standard](https://github.com/slevomat/coding-standard).


Updates `nette/tester` from 2.5.4 to 2.5.5
- [Release notes](https://github.com/nette/tester/releases)
- [Commits](nette/tester@v2.5.4...v2.5.5)

Updates `slevomat/coding-standard` from 8.18.1 to 8.19.1
- [Release notes](https://github.com/slevomat/coding-standard/releases)
- [Commits](slevomat/coding-standard@8.18.1...8.19.1)

---
updated-dependencies:
- dependency-name: nette/tester
  dependency-version: 2.5.5
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
- dependency-name: slevomat/coding-standard
  dependency-version: 8.19.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dev-dependencies
...

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Author: dependabot[bot]