Lowered the number of threads for the rpi CI

.github/workflows/build_all.yml

@@ -291,7 +291,7 @@ jobs:
 
         - name: Build
           working-directory: ${{runner.workspace}}/build
-          run: make VERBOSE=1 -j4
+          run: make VERBOSE=1 -j3
 
         - name: Create Dev Archive
           working-directory: ${{runner.workspace}}