Prepare for Gradle 7 deprecation

[tomodachi94]

It is reasonable to assume that Gradle 9 will release soon (likely within the next two release cycles). As Gradle 7 is now the oldest-supported version of Gradle, it will become EOL when this happens. We cannot reasonably support Gradle 7 once it goes completely end-of-life.

How to help

Below is a list of in-tree consumers.

For each:

• Check if it builds with the latest version of Gradle.
  • If it does, update references from gradle_7 to:
    • gradle_8 (if it relies on features that will be removed in Gradle 9; there should be a warning in the build log if this is the case)
    • gradle (if it does not rely on features scheduled for removal).
  • If it doesn't build with a newer Gradle, attempt to write a patch.
    • Submit it upstream first, especially if upstream is active; the idea is that the fix would be included in the next release of the software, making a special Nixpkgs patch unnecessary and overall contributing to the health of the ecosystem.
    • If upstream is unresponsive and hasn't merged the PR by the time Gradle 9 is released, apply the patch locally.

The list

• freenet (Gradle update to 8.9 hyphanet/fred#977)
  • Patch submitted
  • Released by upstream
  • Updated locally
• scenic-view (Upgraded to Gradle 8.4 JDK 21.0.1 & OpenJFX 21.0.1 JonathanGiles/scenic-view#78)
  • Patch submitted
  • Released by upstream
  • Updated locally
• keyspersecond (RoanH/KeysPerSecond@16fbf06)
  • Patch submitted
  • Released by upstream
  • Updated locally
• openjfx (8314484: Update Gradle to 8.4 openjdk/jfx#1257 and 8337328: JavaFX build uses deprecated features that will be removed in gradle 9 openjdk/jfx#1559)
  • Patch submitted
  • Released by upstream (24+18)
  • Updated locally
• fastddsgen
  • Patch submitted (blocked by Update to Gradle 8 eProsima/IDL-Parser#165)
  • Released by upstream
  • Updated locally
• freeplane (freeplane/freeplane@dc44213 and freeplane/freeplane@f0e7096)
  • Patch submitted
  • Released by upstream (1.12.6)
  • Updated locally
• stirling-pdf (Stirling-Tools/Stirling-PDF@250c317)
  • Patch submitted
  • Released by upstream (1.0.1)
  • Updated locally
• corretto:
  • 11
    • Patch submitted
    • Released by upstream
    • Updated locally
  • 17
    • Patch submitted
    • Released by upstream
    • Updated locally
  • 21
    • Patch submitted
    • Released by upstream
    • Updated locally