[docker] Bump alpine from 3.20.3 to 3.21.0 (#43)

Bumps alpine from 3.20.3 to 3.21.0.

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.20.3 as builder
+FROM alpine:3.21.0 as builder
 
 ARG BUILD_CORES
 ARG GIT_REPOSITORY
@@ -30,7 +30,7 @@ RUN COLOUR='\e[1;93m' && \
   pip install -r /app/requirements.txt && \
   echo -e "${COLOUR}Done.\e[0m"
 
-FROM alpine:3.20.3
+FROM alpine:3.21.0
 LABEL maintainer="Patrick Baus <patrick.baus@physik.tu-darmstadt.de>"
 LABEL description="HighFinesse Wavemeter SCPI deamon."