Fix jenkins tests.

conformance/failure_list_csharp.txt

@@ -1,2 +1,6 @@
 Recommended.JsonInput.FieldNameWithDoubleUnderscores.JsonOutput
+Recommended.JsonInput.FieldNameWithDoubleUnderscores.ProtobufOutput
+Recommended.JsonInput.FieldNameWithDoubleUnderscores.Validator
+Required.JsonInput.FieldNameInLowerCamelCase.Validator
 Required.JsonInput.FieldNameInSnakeCase.JsonOutput
+Required.JsonInput.FieldNameInSnakeCase.ProtobufOutput

jenkins/docker/Dockerfile

@@ -132,7 +132,7 @@ ENV MVN mvn --batch-mode
 RUN cd /tmp && \
   git clone https://github.com/google/protobuf.git && \
   cd protobuf && \
-  git reset 734930f9197b7bc97c3c794c7a949fee2a08c280 && \
+  git reset bf379715c93b581eeb078cec1f0dd8a7d79df431 && \
   ./autogen.sh && \
   ./configure && \
   make -j4 && \