chore(deps): bump python from 8f3aba4 to 21e39cf

Bumps python from `8f3aba4` to `21e39cf`.

---
updated-dependencies:
- dependency-name: python
  dependency-version: 3.13-slim
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: Dockerfile

@@ -1,6 +1,6 @@
 #checkov:skip=CKV_DOCKER_2
 #checkov:skip=CKV_DOCKER_3
-FROM python:3.13-slim@sha256:8f3aba466a471c0ab903dbd7cb979abd4bda370b04789d25440cc90372b50e04
+FROM python:3.13-slim@sha256:21e39cf1815802d4c6f89a0d3a166cc67ce58f95b6d1639e68a394c99310d2e5
 LABEL com.github.actions.name="issue-metrics" \
     com.github.actions.description="Gather metrics on issues/prs/discussions such as time to first response, count of issues opened, closed, etc." \
     com.github.actions.icon="check-square" \