ci: fix commit SHA for stefanbuck/github-issue-parser

The SHA for this action was updated by Dependabot in systemd#25900 to a commit
which later disappeared from the repo. Since then Dependabot kept
(silently) failing to bump the SHA further:

updater | 2024/03/31 21:22:13 ERROR <job_807574419> Error processing stefanbuck/github-issue-parser (Dependabot::SharedHelpers::HelperSubprocessFailed)
updater | 2024/03/31 21:22:13 ERROR <job_807574419> error: no such commit c1a559d78bfb8dd05216dab9ffd2b91082ff5324

See: systemd#25900 (comment)

Let's bump the SHA manually to v3.1.0 to get Dependabot back on the track.

Co-authored-by: Evgeny Vereshchagin <evvers@ya.ru>

.github/workflows/issue_labeler.yml

@@ -23,7 +23,7 @@ jobs:
       - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633
 
       - name: Parse issue form
-        uses: stefanbuck/github-issue-parser@c1a559d78bfb8dd05216dab9ffd2b91082ff5324
+        uses: stefanbuck/github-issue-parser@1e5bdee70d4b3e066a33aa0669ab782943825f94
         id: issue-parser
         with:
           template-path: .github/ISSUE_TEMPLATE/${{ matrix.template }}