devel/git-cliff: update to 0.6.0

Bug Fixes
- Only drop previous releases if skipped (#44)
- Run clippy from nightly toolchain
- Update tests about optional config values
- Set the previous release when using `--unreleased` (#47)
- Lower the priority of global configuration file (#51)
- Update the download link of latest grcov release
- Use the correct tar command for extracting grcov archive
- Update grcov download command
- Update custom error tests

Documentation
- Update template contexts about link_parsers
- Add minimal example
- Update copyright years

Features
- Add `link_parsers` for parsing/extracting links (#42)
- Make the `git` section optional (#45)
- Make the `changelog` section optional (#45)
- [**breaking**] Use conventional commit body to check against commit parsers
- [**breaking**] Replace --topo-order by --date-order (#58)

Miscellaneous Tasks
- Update arg parsing to clap v3 (#49)
- Upgrade dependencies
- Bump the Rust version in Dockerfile
- Run cargo-audit for checking vulnerabilities
- Update the runner to macos-11

Refactor
- Apply clippy suggestions
- [**breaking**] Change the default value of `trim` to `true`
- Unify serde and serde_derive using derive feature (#57)

Styling
- Update the styling
- Comply with MD022 and fix minor typos (#61)

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