[libcxx] Bump runner version in container image

This patch bumps the runner version in the libcxx container image. Here we update
the runner image without updating the rest of the container. We would probably be
fine updating everything, but this lets us test the new workflow for updating the
runner binary independently.

Author: boomanaiden154

libcxx/utils/ci/docker-compose.yml

@@ -4,7 +4,7 @@ x-versions: &compiler_versions
 
 x-image-versions: &image_versions
   BASE_IMAGE: ubuntu:jammy
-  ACTIONS_BASE_IMAGE: builder-base
+  ACTIONS_BASE_IMAGE: ghcr.io/llvm/libcxx-linux-builder-base:77cb0980bcc2675b27d08141526939423fa0be76
 
 services:
   builder-base:
@@ -23,7 +23,7 @@ services:
       dockerfile: Dockerfile
       target: actions-builder
       args:
-        GITHUB_RUNNER_VERSION: "2.326.0"
+        GITHUB_RUNNER_VERSION: "2.327.1"
         <<: [*image_versions, *compiler_versions]
 
   android-buildkite-builder: