Fix gradle conflict resolution for Cronet tests

This resolves the following constraint resolution issue when running our release script:

> Cannot find a version of 'org.chromium.net:cronet-api' that satisfies the version constraints:
    Dependency path 'com.google.android.exoplayer:extension-cronet:unspecified' --> 'com.google.android.gms:play-services-cronet:17.0.0' --> 'org.chromium.net:cronet-api:72.3626.96'
    Constraint path 'com.google.android.exoplayer:extension-cronet:unspecified' --> 'org.chromium.net:cronet-api:{strictly 72.3626.96}' because of the following reason: debugRuntimeClasspath uses version 72.3626.96
    Dependency path 'com.google.android.exoplayer:extension-cronet:unspecified' --> 'org.chromium.net:cronet-embedded:76.3809.111' --> 'org.chromium.net:cronet-common:76.3809.111' --> 'org.chromium.net:cronet-api:76.3809.111'

#minor-release

PiperOrigin-RevId: 355414968

extensions/cronet/build.gradle

@@ -28,9 +28,9 @@ dependencies {
     androidTestImplementation 'androidx.test:rules:' + androidxTestRulesVersion
     androidTestImplementation 'androidx.test:runner:' + androidxTestRunnerVersion
     androidTestImplementation 'androidx.multidex:multidex:' + androidxMultidexVersion
-    // Emulator tests assume that an app-packaged version of cronet is
+    // Instrumentation tests assume that an app-packaged version of cronet is
     // available.
-    androidTestImplementation 'org.chromium.net:cronet-embedded:76.3809.111'
+    androidTestImplementation 'org.chromium.net:cronet-embedded:72.3626.96'
     androidTestImplementation(project(modulePrefix + 'testutils'))
     testImplementation project(modulePrefix + 'library')
     testImplementation project(modulePrefix + 'testutils')