build: bump the repo toolchain to JDK 25 (#6208)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

.github/actions/gradle-setup/action.yml

@@ -23,10 +23,10 @@ runs:
     - name: Validate Gradle Wrapper
       uses: gradle/actions/wrapper-validation@v6
 
-    - name: Set up JDK 21
+    - name: Set up JDK 25
       uses: actions/setup-java@v5
       with:
-        java-version: '21'
+        java-version: '25'
         distribution: ${{ inputs.jdk_distribution }}
         token: ${{ github.token }}
 

.github/copilot-instructions.md

@@ -4,7 +4,7 @@
 
 ## Build, Test & Lint (essentials)
 
-Requires JDK 21 and `ANDROID_HOME`. Per fresh clone:
+Requires JDK 25 and `ANDROID_HOME`. Per fresh clone:
 ```bash
 [ -f local.properties ] || cp secrets.defaults.properties local.properties
 ```

.github/workflows/verify-flatpak.yml

@@ -34,12 +34,16 @@ jobs:
       - uses: actions/setup-java@v5
         with:
           distribution: temurin
-          java-version: 21
+          java-version: 25
+          token: ${{ github.token }}
 
+      # JBR resolves its version list via the GitHub API — unauthenticated requests
+      # rate-limit on the shared runner IPs, so the token is required, not optional.
       - uses: actions/setup-java@v5
         with:
           distribution: jetbrains
-          java-version: 21
+          java-version: 25
+          token: ${{ github.token }}
 
       - uses: gradle/actions/setup-gradle@v6
 
@@ -74,10 +78,10 @@ jobs:
         with:
           name: flatpak-sources
 
-      - name: Clone vid's flatpak repo
+      - name: Clone the Flathub packaging repo
         run: |
           git clone --depth 1 --recurse-submodules \
-            https://github.com/vidplace7/org.meshtastic.MeshtasticDesktop.git \
+            https://github.com/flathub/org.meshtastic.MeshtasticDesktop.git \
             "$RUNNER_TEMP/org.meshtastic.MeshtasticDesktop"
 
       - name: Wire overlay manifest + sources