Allow using any UID from a key

[txtsd]

Behaviour

Steps to reproduce this issue

1. Create a key with at least 2 UIDs
2. Use the key with this action, but set git_committer_email to any UID except the first one (when viewed with gpg -K)

Expected behaviour

This action should be able to seamlessly use any UID from the gpg key

Actual behaviour

Instead we get an error:

Committer email "email_3@domain.tld" (name: "txtsd") does not match GPG private key email "email_1@domain.tld" (name: "txtsd")