Should not tell me to merge the Release PR for RCs

[hacdias]

The release PR (e.g. ipfs/kubo#10287) generated by kuboreleaser should only be merged for the final release as per the release instructions: https://github.com/ipfs/kubo/blob/02ea51872b9258a95d549ea8116c739be796cb65/docs/RELEASE_ISSUE_TEMPLATE.md?plain=1#L87-L105

However, kuboreleaser asks me to merge it for pre-releases too:

$ ./kuboreleaser --skip-check-before release --version v0.26.0-rc1 prepare-branch
INFO[2024-01-11 08:13:51] Skipping the check before running the action
INFO[2024-01-11 08:13:51] Running the action...
INFO[2024-01-11 08:13:51] I'm going to create PRs that update the version in the release branch and the master branch.
INFO[2024-01-11 08:13:51] I'm also going to update the changelog if we're performing the final release. Please note that it might take a while because I have to clone a looooot of repos.
Your release PR is ready at https://github.com/ipfs/kubo/pull/10287
If needed, check out the release-v0.26.0 branch of ipfs/kubo repository and cherry-pick commits from master using the following command:

git cherry-pick -x <commit>

Please approve after all the required commits are cherry-picked.

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Go to https://github.com/ipfs/kubo/pull/10288, ensure the CI checks pass, and merge the PR.

Please approve once the PR is merged.

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