Bumps [actions/setup-go](https://github.com/actions/setup-go) from 5 to 6.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](https://github.com/actions/setup-go/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-go
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

1. add .editorconfig file, add rules for .sh .bash files.
2. add make fmt target, use:
    - gofmt *.go.
    - shfmt *.sh *.bash, shell/completion.bash, shell/key-bindings.bash
        need a left indent due to an outermost if block.
3. add shfmt check for bash scripts in make lint target.
4. install shfmt in actions.

This commit updates github.com/charlievieth/fastwalk to v1.0.13 which
addresses fastwalk issue #61. It also updates the minimum supported Go
version to 1.21 (up from 1.20) since that is now the minimum version
supported by fastwalk.

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Bumps [crate-ci/typos](https://github.com/crate-ci/typos) from 1.28.4 to 1.29.4.
- [Release notes](https://github.com/crate-ci/typos/releases)
- [Changelog](https://github.com/crate-ci/typos/blob/master/CHANGELOG.md)
- [Commits](https://github.com/crate-ci/typos/compare/v1.28.4...v1.29.4)

---
updated-dependencies:
- dependency-name: crate-ci/typos
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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