Bump astronomer/astro-runtime

Bumps astronomer/astro-runtime from 12.4.0-python-3.12 to 12.6.0-python-3.12.

---
updated-dependencies:
- dependency-name: astronomer/astro-runtime
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Dockerfile

@@ -1 +1 @@
-FROM quay.io/astronomer/astro-runtime:12.4.0-python-3.12
+FROM quay.io/astronomer/astro-runtime:12.6.0-python-3.12