Bump ubuntu from 20.04 to 22.04 in /.ci/release-ci/ubuntu (#852)

Bumps ubuntu from 20.04 to 22.04.

---
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>

.ci/release-ci/ubuntu/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:20.04
+FROM ubuntu:22.04
 
 LABEL maintainer="mail@sobolevn.me"
 LABEL vendor="git-secret team"