chore(deps): update docker.io/alpine docker tag to v3.20

Author: renovate[bot]

Dockerfile.multiarch

@@ -8,7 +8,7 @@ WORKDIR /src
 
 RUN make build
 
-FROM docker.io/alpine:3.19@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b
+FROM docker.io/alpine:3.20@sha256:77726ef6b57ddf65bb551896826ec38bc3e53f75cdde31354fbffb4f25238ebd
 
 LABEL maintainer="ownCloud DevOps <[email protected]>"
 LABEL org.opencontainers.image.authors="ownCloud DevOps <[email protected]>"