Bump mfinelli/setup-shfmt from 2 to 3 (#346)

Bumps [mfinelli/setup-shfmt](https://github.com/mfinelli/setup-shfmt) from 2 to 3.
- [Release notes](https://github.com/mfinelli/setup-shfmt/releases)
- [Changelog](https://github.com/mfinelli/setup-shfmt/blob/master/CHANGELOG.md)
- [Commits](mfinelli/setup-shfmt@v2...v3)

---
updated-dependencies:
- dependency-name: mfinelli/setup-shfmt
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/pre-main.yml

@@ -38,7 +38,7 @@ jobs:
           SHELLCHECK_OPTS: --external-sources
         with:
           ignore_names: mo
-      - uses: mfinelli/setup-shfmt@v2
+      - uses: mfinelli/setup-shfmt@v3
       - run: shfmt -d scripts/*.sh
       - uses: crate-ci/typos@master
       - uses: ibiqlik/action-yamllint@v3