Resolve "Add PostRenderer and bump keycloak version"

Package Merge Request

BigBang changes

• Add postrenderer for Keycloak

Package Changes

• Bump keycloak version. Change to P1 custom plugin: allow underscore characters in the client name.
• add OSCAL document
• refresh DoD CA pem file
• move MODIFICATIONS.md to /docs/PACKAGE_UPDATES.md and add more upgrade and testing documentation

Package MR

https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/merge_requests/65
https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/merge_requests/67

For Issue

Closes https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/1151
Closes https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/issues/55
Closes https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/999
Closes https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/issues/59