CI: -j4 with lin/win runners

https://docs.github.com/en/actions/using-github-hosted-runners/using-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories

.github/workflows/build.yml

@@ -81,7 +81,7 @@ jobs:
     - name: build
       run: |
         ${{env.CCACHE_SETTINGS}}
-        make release-static-win64 -j2
+        make release-static-win64 -j4
 
   build-debian:
     name: 'build-debian (debian-10)'
@@ -163,7 +163,7 @@ jobs:
       run: |
         ${{env.CCACHE_SETTINGS}}
         cmake .
-        make wallet_api -j3
+        make wallet_api -j4
 
   test-ubuntu:
     needs: build-ubuntu

.github/workflows/depends.yml

@@ -92,7 +92,7 @@ jobs:
     - name: build
       run: |
         ${{env.CCACHE_SETTINGS}}
-        make depends target=${{ matrix.toolchain.host }} -j2
+        make depends target=${{ matrix.toolchain.host }} -j4
     - uses: actions/upload-artifact@v4
       if: ${{ matrix.toolchain.host == 'x86_64-w64-mingw32' || matrix.toolchain.host == 'x86_64-apple-darwin' || matrix.toolchain.host == 'aarch64-apple-darwin' || matrix.toolchain.host == 'x86_64-unknown-linux-gnu' }}
       with: