Upgrade python 3.7 to 3.8 in sync github action (#629)

### Changes

- Upgrade python version from 3.7 to 3.8 in sync github action, as sync
is about to deprecate that github action

### References

-
https://updates.snyk.io/final-reminder-on-snyk-cli-images-and-snyk-images-containing-eol-software-297657
-
https://docs.snyk.io/scm-ide-and-ci-cd-integrations/snyk-ci-cd-integrations/eol-policy-snyk-images/images-no-longer-supported-by-snyk

### Testing

- [ ] This change adds unit test coverage
- [ ] This change adds integration test coverage
- [ ] This change has been tested on the latest version of the
platform/language or why not

### Checklist

- [ ] I have read the [Auth0 general contribution
guidelines](https://github.com/auth0/open-source-template/blob/master/GENERAL-CONTRIBUTING.md)
- [ ] I have read the [Auth0 Code of
Conduct](https://github.com/auth0/open-source-template/blob/master/CODE-OF-CONDUCT.md)
- [ ] All existing and new tests complete without errors

Author: arpit-jn

.github/workflows/snyk.yml

@@ -34,7 +34,7 @@ jobs:
         with:
           ref: ${{ github.event.pull_request.head.sha || github.ref }}
 
-      - uses: snyk/actions/python-3.7@b98d498629f1c368650224d6d212bf7dfa89e4bf # pin@0.4.0
+      - uses: snyk/actions/python-3.8@4a528b5c534bb771b6e3772656a8e0e9dc902f8b # pinned 2023-06-13
         continue-on-error: true # Make sure the SARIF upload is called
         env:
           SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}