fix: update python version for lint (#401)

### Description

Test run: 

https://github.com/splunk/splunk-add-on-for-github-audit-log-monitoring/actions/runs/14998008338/job/42137066553


https://github.com/splunk/splunk-add-on-for-salesforce/actions/runs/15015649052/job/42192839796

### Checklist

- [ ] `README.md` has been updated or is not required
- [ ] push trigger tests
- [ ] manual release test
- [ ] automated releases test
- [ ] pull request trigger tests
- [ ] schedule trigger tests
- [ ] workflow errors/warnings reviewed and addressed

### Testing done 
(for each selected checkbox, the corresponding test results link should
be listed here)

Author: harshilgajera-crest

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

@@ -346,7 +346,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.7"
+          python-version: "3.9"
       - uses: pre-commit/action@v3.0.1
 
   review_secrets: