Bump alpine from 3.19.1 to 3.20.0 in /scripts/release

Bumps alpine from 3.19.1 to 3.20.0.

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

Signed-off-by: dependabot[bot] <support@github.com>

scripts/release/Dockerfile

@@ -6,7 +6,7 @@
 # You may obtain a copy of the License at the LICENSE file in
 # the root directory of this source tree.
 
-FROM alpine:3.19.1
+FROM alpine:3.20.0
 
 COPY terraform-docs /usr/local/bin/terraform-docs