gh-gl-sync: Fix broken sync script

The sync script image became broken recently when it was rebuilt and
picked up python 3.11.  At that point, one of the dependencies of the
github package, wrapt, started failing.  See here:

GrahamDumpleton/wrapt#196

This pins python at 3.10 until the github package can update its
(possibly transitive) dependency on wrapt to the fixed version.

.github/workflows/custom_docker_builds.yml

@@ -27,7 +27,7 @@ jobs:
           - python-aws-bash
         include:
           - docker-image: gh-gl-sync
-            image-tags: ghcr.io/spack/ci-bridge:0.0.30
+            image-tags: ghcr.io/spack/ci-bridge:0.0.31
           - docker-image: gitlab-api-scrape
             image-tags: ghcr.io/spack/gitlab-api-scrape:0.0.2
           - docker-image: ci-key-rotate

images/gh-gl-sync/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3
+FROM python:3.10
 
 WORKDIR /scripts/
 COPY requirements.txt ./

k8s/custom/gh-gl-sync/cron-jobs.yaml

@@ -15,7 +15,7 @@ spec:
           restartPolicy: Never
           containers:
           - name: sync
-            image: ghcr.io/spack/ci-bridge:0.0.30
+            image: ghcr.io/spack/ci-bridge:0.0.31
             imagePullPolicy: IfNotPresent
             resources:
               requests: