Update protovalidate to v1.2.0 (#448)

Update protovalidate to `v1.2.0`. The only changes are in tests to
update the matching values.

Signed-off-by: Sri Krishna <skrishna@buf.build>

Author: srikrsna-buf

gradle.properties

@@ -1,5 +1,5 @@
 # Version of buf.build/bufbuild/protovalidate to use.
-protovalidate.version = 895eefca6d1346f742fc18b9983d40478820906d
+protovalidate.version = v1.2.0
 
 # Arguments to the protovalidate-conformance CLI
 protovalidate.conformance.args = --strict_message --strict_error --expected_failures=expected-failures.yaml