Bump alpine from 3.19.1 to 3.20.1

Bumps alpine from 3.19.1 to 3.20.1.

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

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

Dockerfile

@@ -51,7 +51,7 @@ WORKDIR /languagetool
 
 # Note: When changing the base image, verify that the hunspell.sh workaround is
 # downloading the matching version of `libhunspell`. The URL may need to change.
-FROM alpine:3.19.1
+FROM alpine:3.20.1
 
 RUN apk add --no-cache \
     bash \