semver_release action improvement

[nkhralovich]

Issue:
I use this action quite frequently, and I noticed that if I create a tag from the last commit named "-023ke" and then try to create one more tag from the same commit, it won't argue. It will though when I will try to create a new tag from a new commit, so I need to go back, remove the duplicated tag and create a new one from the last commit.

Solution:
Change the logic so the script won't allow us to create two tags from the same commit.