chore(deps): bump alpine from 3.20 to 3.21 in the docker group

Bumps the docker group with 1 update: alpine.


Updates `alpine` from 3.20 to 3.21

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

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

Dockerfile

@@ -14,7 +14,7 @@ RUN VERSION=${VERSION:-"$(echo $(git describe --abbrev=0 --tags)+$(git rev-parse
 	-X github.com/uselagoon/lagoon-cli/cmd.lagoonCLIBuild=$BUILD \
 	-X github.com/uselagoon/lagoon-cli/cmd.lagoonCLIBuildGoVersion=go$GOLANG_VERSION" -o lagoon .
 
-FROM alpine:3.20
+FROM alpine:3.21
 
 WORKDIR /root/
 COPY --from=build /go/src/github.com/uselagoon/lagoon-cli/lagoon /lagoon