Update golang tests

PiperOrigin-RevId: 520069861

.buildkite/pipeline.yaml

@@ -448,7 +448,7 @@ steps:
   - <<: *common
     <<: *docker
     label: ":golang: Go runtime tests"
-    command: make RUNTIME_LOG_DIR=/tmp/$${BUILDKITE_JOB_ID} go1.16-runtime-tests
+    command: make RUNTIME_LOG_DIR=/tmp/$${BUILDKITE_JOB_ID} go1.20-runtime-tests
     parallelism: 10
     agents:
       <<: *platform_specific_agents

images/runtimes/go1.20/Dockerfile.x86_64

@@ -1,4 +1,4 @@
-FROM golang:1.16
+FROM golang:1.20
 
 # Compile the tests during build to save time during testing.
 RUN ["go", "tool", "dist", "test", "-compile-only"]

test/runtimes/BUILD

@@ -7,8 +7,8 @@ package(
 )
 
 runtime_test(
-    name = "go1.16",
-    exclude_file = "exclude/go1.16.csv",
+    name = "go1.20",
+    exclude_file = "exclude/go1.20.csv",
     lang = "go",
     shard_count = more_shards,
 )