Bump alpine from 3.13 to 3.14.0 in /.ci/docker-ci/alpine (#688)

Bumps alpine from 3.13 to 3.14.0.

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

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

.ci/docker-ci/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.13
+FROM alpine:3.14.0
 
 LABEL maintainer="mail@sobolevn.me"
 LABEL vendor="git-secret team"