deprecating GITHUB_TOKEN authentication

[shogo82148]

Currently, we use GITHUB_TOKEN to authenticate the action.
Now, we can use JWT tokens of Open ID Connect instead of GITHUB_TOKEN.
JWT tokens are more secure than GITHUB_TOKEN because they cannot do anything on their own. GITHUB_TOKEN authentication should be removed.

[shogo82148]

See https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/about-security-hardening-with-openid-connect