update csharp image

.github/workflows/test_csharp.yml

diff --git a/.github/workflows/test_csharp.yml b/.github/workflows/test_csharp.yml
index 8b04ff4..a6c449e 100644
--- a/.github/workflows/test_csharp.yml
+++ b/.github/workflows/test_csharp.yml
@@ -25,7 +25,7 @@
       - name: Run tests
         uses: protocolbuffers/protobuf-ci/docker@v3
         with:
-          image: us-docker.pkg.dev/protobuf-build/containers/test/linux/csharp:3.1.415-6.0.100-66964dc8b07b6d1fc73a5cc14e59e84c1c534cea
+          image: us-docker.pkg.dev/protobuf-build/containers/test/linux/csharp:3.1.415-6.0.100-cf84e92285ca133b9c8104ad7b14d70e953cbb8e
           credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
           entrypoint: /bin/bash
           command: >-
@@ -41,7 +41,7 @@
       - name: Run conformance tests
         uses: protocolbuffers/protobuf-ci/bazel-docker@v3
         with:
-          image: us-docker.pkg.dev/protobuf-build/containers/test/linux/csharp:3.1.415-6.0.100-66964dc8b07b6d1fc73a5cc14e59e84c1c534cea
+          image: us-docker.pkg.dev/protobuf-build/containers/test/linux/csharp:3.1.415-6.0.100-cf84e92285ca133b9c8104ad7b14d70e953cbb8e
           credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
           bazel-cache: csharp_linux
           bazel: test //csharp:conformance_test --action_env=DOTNET_CLI_TELEMETRY_OPTOUT=1 --test_env=DOTNET_CLI_HOME=/home/bazel