Use github.token by default

[blooper05]

Hi! Thank you for a pretty GitHub Action 🐶

I would suggest to use github.token by default for GITHUB_TOKEN as well as the following actions and templates.

• https://github.com/reviewdog/action-remark-lint/blob/v5.6.0/action.yml#L20-L23
• https://github.com/reviewdog/action-template/blob/v1.10.1/action.yml#L5-L7
• Use github.token by default action-shellcheck#7

Please check my changes and merge them if you like it. Thanks!

[shogo82148]

LGTM!

[github-actions]

🚀 [bumpr] Bumped! New version:v0.7.1 Changes:v0.7.0...v0.7.1

[review-dog]

Hi, @blooper05! We merged your PR to reviewdog! 🐶
Thank you for your contribution! ✨

We just invited you to join the @reviewdog organization on GitHub.
Accept the invite by visiting https://github.com/orgs/reviewdog/invitation.
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Thanks again!