Re-add forwarder tests to the CI

Author: vickenty

.github/workflows/ci.yml

@@ -12,10 +12,10 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        java-version: ['9', '11', '13', '17']
+        java-version: [9, 11, 13, 17]
         include:
           - os: windows-latest
-            java-version: '12'
+            java-version: 12
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
@@ -28,6 +28,10 @@ jobs:
       - name: Build and test dogstatsd-http-core
         run: mvn clean install
         working-directory: dogstatsd-http-core
+      - name: Build and test dogstatsd-http-forwarder
+        if: matrix.java-version >= 11
+        run: mvn clean install
+        working-directory: dogstatsd-http-forwarder
 
   test-jnr-exclude:
     name: Test (Java 9, jnr-exclude)