Bump alpine from 3.18.2 to 3.19.1 in /.ci/docker-ci/alpine

Bumps alpine from 3.18.2 to 3.19.1.

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.ci/docker-ci/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.18.2
+FROM alpine:3.19.1
 
 LABEL maintainer="[email protected]"
 LABEL vendor="git-secret team"