revertrisk: upgrade to 0.12.1

Bump kserve to 0.12.1 that includes the following fixes we need:

* support for pydantic v2 (kserve/kserve#3374) which is used by knowledge_integrity v0.6
* fix for ray serve compatibility issue (kserve/kserve#3556).

Bug: T363127
Change-Id: I3fd7c5963c647ab1f407f21c4bd9e2b530fe8a47

revert_risk_model/model_server/revertrisk/requirements.txt

@@ -1,6 +1,3 @@
 knowledge_integrity[revertrisk] @ git+https://gitlab.wikimedia.org/repos/research/knowledge_integrity.git@9845373b15b45e32e60e7ddecf04baf6bc6c25d1
-# we use a specific commit for kserve because it has necessary fixes, including
-# (1) support for pydantic v2 (https://github.com/kserve/kserve/pull/3374) which is used by knowledge_integrity v0.6
-# (2) fix for ray serve compatibility issue (https://github.com/kserve/kserve/pull/3556).
-kserve @ git+https://github.com/kserve/kserve.git@9026d8a9a55697bb9a6e524d91e7ec36ceb00f2a#egg=kserve&subdirectory=python/kserve
+kserve==0.12.1
 PyYAML==6.0.1