Remove v4.7 release notes from branch

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/release-notes/version-4.7.md

@@ -1,15 +0,0 @@
-# NetBox v4.7
-
-## v4.7.0 (FUTURE)
-
-### Breaking Changes
-
-* The minimum required PostgreSQL version has been raised from 14 to 15.
-
-### Enhancements
-
-### Other Changes
-
-* [#20546](https://github.com/netbox-community/netbox/issues/20546) - Raise the minimum required PostgreSQL version from 14 to 15
-
-### REST API Changes