8181698: Remove and retag 8u141-b12 tag from source repository

Reviewed-by: robm
diff --git a/jdk/.hgtags b/jdk/.hgtags
index d0b4db8..382e063 100644
--- a/jdk/.hgtags
+++ b/jdk/.hgtags
@@ -703,3 +703,5 @@
 c92d704420d707d3016d8ee3a4239d1c57692ddd jdk8u141-b10
 3237f27a9d22ee02d0bfbd6f662a4d948d25a74f jdk8u141-b11
 2966589b3f330b6e676418b48d2960e294d35060 jdk8u141-b12
+2966589b3f330b6e676418b48d2960e294d35060 jdk8u141-b12
+0000000000000000000000000000000000000000 jdk8u141-b12