Bump python from 3.14.7-alpine to 3.15.0rc3-alpine

Bumps python from 3.14.7-alpine to 3.15.0rc3-alpine.

---
updated-dependencies:
- dependency-name: python
  dependency-version: 3.15.0rc3-alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Dockerfile

@@ -54,7 +54,7 @@ RUN which php; php -v; php -m; php -i | grep ini
 # Python
 #
 # https://hub.docker.com/_/python/
-FROM python:3.14.7-alpine
+FROM python:3.15.0rc3-alpine
 
 RUN pip install virtualenv && rm -rf /root/.cache
 RUN python -V