Unfreeze benchmarks reference to test-infra repo. (#28801)

Follow-up to #28797.

tools/internal_ci/linux/grpc_e2e_performance_gke.sh

@@ -67,11 +67,8 @@ go get "golang.org/dl/${TEST_INFRA_GOVERSION}"
 
 # Fetch test-infra repository and build all tools.
 pushd ..
-git clone https://github.com/grpc/test-infra.git
+git clone --depth 1 https://github.com/grpc/test-infra.git
 cd test-infra
-# Freeze test-infra repo to account for incompatible change.
-# See https://github.com/grpc/test-infra/pull/267.
-git checkout ce3352fe5d07f13c908748e61610914f87cd4af1
 git log -1 --oneline
 make GOCMD="${TEST_INFRA_GOVERSION}" all-tools
 popd

tools/internal_ci/linux/grpc_e2e_performance_gke_experiment.sh

@@ -65,11 +65,8 @@ go get "golang.org/dl/${TEST_INFRA_GOVERSION}"
 
 # Note: Submodules are not required for tools build.
 pushd ..
-git clone https://github.com/grpc/test-infra.git
+git clone --depth 1 https://github.com/grpc/test-infra.git
 cd test-infra
-# Freeze test-infra repo to account for incompatible change.
-# See https://github.com/grpc/test-infra/pull/267.
-git checkout ce3352fe5d07f13c908748e61610914f87cd4af1
 git log -1 --oneline
 make GOCMD="${TEST_INFRA_GOVERSION}" all-tools
 popd