Bump mini_racer from 0.6.3 to 0.8.0

[dependabot[bot]]

Bumps mini_racer from 0.6.3 to 0.8.0.

Changelog

Sourced from mini_racer's changelog.

• 0.8.0 - 29-05-2022

  • Target Node to 18.16.0.0

• 0.7.0 - 29-05-2022

  • Target Node to 17.9.1.0

• 0.6.4 - 25-05-2022

  • Target Node 16.19.0.0

Commits

• 877b722 tidy changelog and prep for 0.8 release
• e606146 update changelog to reflect 0.7 release
• 2db9b00 removes outdated comment
• 657a6ff switches to including files in spec.files (vs filtering)
• b9c4e5d excludes ./.github and ./bin from spec.files
• e58cb21 adds dependabot config for updating github actions
• 372cfd7 Use latest bundler to get the fix of https://github.com/rubygems/rubygems/iss...
• b45a4c7 Merge branch 'libv8-node-18'
• 0978356 Bump to libv8-node 18.16.0.0
• 7033b30 Merge branch 'master' into libv8-node-18
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #1326.