ci: add RELEASE_NOTE.md to .gitignore (backport #362)

[mergify]

Description

closes: #XXXX

goreleaser doesn't allow to modify git state during processing. So we need to add RELEASE_NOTE.md to .gitignore.

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.

---

This is an automatic backport of pull request #362 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 15bbe34 has failed:

On branch mergify/bp/release/v4.0.x/pr-362
Your branch is up to date with 'origin/release/v4.0.x'.

You are currently cherry-picking commit 15bbe34.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .gitignore

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally