ci: fix ubuntu version to 22.04 (#894)

This PR sets ubuntu version to 22.04 for scripts run with python 3.7.
Reference:
[ADDON-75861](https://splunk.atlassian.net/browse/ADDON-75861)

.github/workflows/build-test-release.yml

@@ -58,7 +58,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.7"
+          python-version: "3.12"
       - uses: pre-commit/[email protected]
 
   semgrep:
@@ -132,7 +132,7 @@ jobs:
       - fossa-scan
       - compliance-copyrights
       - test-splunk-unit
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
       matrix:
@@ -166,7 +166,7 @@ jobs:
     needs:
       - test-splunk-external
       - test-splunk-matrix
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
         with: