Tests: Fix Maven build issue with IAB Tech Lab's Protobuf (#3807)

Author: osulzhenko

.github/workflows/pr-java-ci.yml

@@ -23,7 +23,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Set up JDK
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
           cache: 'maven'

src/test/proto/test-opernrtb.proto

@@ -81,11 +81,6 @@ extend com.iabtechlab.openrtb.v2.NativeRequest.EventTrackers {
     optional TestExt eventTrackers = 8871;
 }
 
-extend com.iabtechlab.openrtb.v2.BidRequest.Imp.Video.CompanionAd {
-
-    optional TestExt companionAd = 8871;
-}
-
 extend com.iabtechlab.openrtb.v2.NativeRequest.Asset.Data {
 
     optional TestExt nativeData = 8871;