Bump credo from 1.5.4 to 1.5.6

[dependabot-preview[bot]]

Bumps credo from 1.5.4 to 1.5.6.

Changelog

Sourced from credo's changelog.

1.5.6

• Ensure compatibility with Elixir 1.12

1.5.5

• Fix bug where compilation warnings are shown if compilation directory is not part of a Git work tree
• Fix bug in mix credo diff where too many issues are reported because

Commits

• 9bee6e0 Bump version to 1.5.6
• 62b12d2 Update CHANGELOG
• 01578e4 Fix tests for Elixir versions < 1.12
• 30fab35 Update CI to use erlef/setup-beam
• be5c628 Fix interpolation helper for Elixir 1.12
• bd56b12 Fix space around operators check
• 4cceec0 Use Elixir 1.12.0-rc.0
• 3647750 Bump version to 1.5.5
• 6d9aeb5 Update CHANGELOG
• 404886a Check if cwd is a Git directory when compiling
• Additional commits viewable in compare view

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