chore(safety): ignore GitPython CVEs CVE-2023-{40590,41040}

GitPython is a development-only dependency of Bandit, which will be
obsoleted by #6961.  In the meantime:

- CVE-2023-40590 (Safety 60789) affects Windows, which we don't support.
- CVE-2023-41040 (Safety 60841) is not exploitable for our use of
  GitPython via Bandit.

Makefile

@@ -167,6 +167,8 @@ safety:  ## Run `safety check` to check python dependencies for vulnerabilities.
                 --ignore 58912 \
                 --ignore 59473 \
                 --ignore 60350 \
+		--ignore 60789 \
+		--ignore 60841 \
 		--full-report -r $$req_file \
 		&& echo -e '\n' \
 		|| exit 1; \