JCommander: Downgrade Errorprone warning

Ensure that CollectionIncompatibleType isn't fatal until an
upstream fix can be imported.

Bug: 73288226
Bug: 74215153
Test: m javac-check RUN_ERROR_PRONE=true
Change-Id: I020b7b2d325002f5a68377baa3ea5032c79c377a
diff --git a/Android.bp b/Android.bp
index 63f2244..d422eb2 100644
--- a/Android.bp
+++ b/Android.bp
@@ -31,4 +31,10 @@
             exclude_srcs: ["src/main/**/PathConverter.java"],
         },
     },
+
+    errorprone: {
+        javacflags: [
+            "-Xep:CollectionIncompatibleType:WARN",  // b/74215153
+        ],
+    }
 }