Upgrade OPA gatekeeper to v3.4.0

Summary

Upgrade OPA Gatekeeper to v3.4.0

Package Links

• https://repo1.dso.mil/platform-one/big-bang/apps/core/policy/-/releases/3.4.0-bb.0
• https://repo1.dso.mil/platform-one/big-bang/apps/core/policy/-/merge_requests/43 (Upgrade to v3.4.0)
• https://repo1.dso.mil/platform-one/big-bang/apps/core/policy/-/merge_requests/44 (Removal of deprecated constraint templates)
• https://repo1.dso.mil/platform-one/big-bang/apps/core/policy/-/merge_requests/22 (Documentation)

Closes https://repo1.dso.mil/platform-one/big-bang/apps/core/policy/-/issues/2