Use dependabot to manage the dependencies defined in go.mod and
GitHub Actions workflows, so that we can proactively update versions.

Outdated versions of third-party dependencies frequently have known
security vulnerabilities with CVEs.

* Pin runners to ubuntu-20.04 so that we can control upgrades
* Update GitHub official actions to latest major versions (v2)
* Build on push events on default branch, as well as pull request
  events against the default branch

Bumps [github.com/fatih/color](https://github.com/fatih/color) from 1.7.0 to 1.10.0.
- [Release notes](https://github.com/fatih/color/releases)
- [Commits](fatih/color@v1.7.0...v1.10.0)

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Bumps [github.com/alecthomas/chroma](https://github.com/alecthomas/chroma) from 0.7.0 to 0.9.1.
- [Release notes](https://github.com/alecthomas/chroma/releases)
- [Changelog](https://github.com/alecthomas/chroma/blob/master/.goreleaser.yml)
- [Commits](alecthomas/chroma@v0.7.0...v0.9.1)

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Bumps [cloud.google.com/go](https://github.com/googleapis/google-cloud-go) from 0.49.0 to 0.81.0.
- [Release notes](https://github.com/googleapis/google-cloud-go/releases)
- [Changelog](https://github.com/googleapis/google-cloud-go/blob/master/CHANGES.md)
- [Commits](googleapis/google-cloud-go@v0.49.0...v0.81.0)

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Bumps [github.com/fatih/color](https://github.com/fatih/color) from 1.10.0 to 1.11.0.
- [Release notes](https://github.com/fatih/color/releases)
- [Commits](fatih/color@v1.10.0...v1.11.0)

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

Bumps [github.com/google/go-cmp](https://github.com/google/go-cmp) from 0.5.5 to 0.5.6.
- [Release notes](https://github.com/google/go-cmp/releases)
- [Commits](google/go-cmp@v0.5.5...v0.5.6)

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Bumps [github.com/fatih/color](https://github.com/fatih/color) from 1.11.0 to 1.12.0.
- [Release notes](https://github.com/fatih/color/releases)
- [Commits](fatih/color@v1.11.0...v1.12.0)

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Bumps [cloud.google.com/go](https://github.com/googleapis/google-cloud-go) from 0.81.0 to 0.82.0.
- [Release notes](https://github.com/googleapis/google-cloud-go/releases)
- [Changelog](https://github.com/googleapis/google-cloud-go/blob/master/CHANGES.md)
- [Commits](googleapis/google-cloud-go@v0.81.0...v0.82.0)

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Bumps [cloud.google.com/go](https://github.com/googleapis/google-cloud-go) from 0.82.0 to 0.83.0.
- [Release notes](https://github.com/googleapis/google-cloud-go/releases)
- [Changelog](https://github.com/googleapis/google-cloud-go/blob/master/CHANGES.md)
- [Commits](googleapis/google-cloud-go@v0.82.0...v0.83.0)

---
updated-dependencies:
- dependency-name: cloud.google.com/go
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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