⬆ Bump alpine from 3.20 to 3.21

Bumps alpine from 3.20 to 3.21.

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Dockerfile

@@ -1,5 +1,5 @@
 # Bygg noen artefakter vi trenger senere
-FROM alpine:3.20 AS build
+FROM alpine:3.21 AS build
 
 # GCP profiling agent
 RUN mkdir -p /opt/cprof && \