Bump ubuntu from a6d2b38 to 19478ce (#33)

Bumps ubuntu from `a6d2b38` to `19478ce`.

---
updated-dependencies:
- dependency-name: ubuntu
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:22.04@sha256:a6d2b38300ce017add71440577d5b0a90460d0e57fd7aec21dd0d1b0761bbfb2
+FROM ubuntu:22.04@sha256:19478ce7fc2ffbce89df29fea5725a8d12e57de52eb9ea570890dc5852aac1ac
 
 LABEL maintainer="Antrea <projectantrea-dev@googlegroups.com>"
 LABEL description="A Docker-based Github action to determine if changes were made outside of a provided path exclusion list."