Bump alpine from 3.20.0 to 3.20.3 (#417)

Bumps alpine from 3.20.0 to 3.20.3.

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

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

Dockerfile

@@ -19,7 +19,7 @@ RUN CGO_ENABLED=0 GOOS=linux GOARCH=$TARGETARCH GO111MODULE=on \
 ## Runtime
 ##
 
-FROM --platform=$TARGETPLATFORM alpine:3.20.0 as runtime
+FROM --platform=$TARGETPLATFORM alpine:3.20.3 as runtime
 RUN apk add iptables-legacy iptables libcap && \
     touch /run/xtables.lock && \
     chmod 0666 /run/xtables.lock

Dockerfile-cni-plugin

@@ -34,7 +34,7 @@ RUN --mount=type=cache,target=target \
     just cni-repair-controller arch="$TARGETARCH" profile=release build && \
     mv "target/$target/release/linkerd-cni-repair-controller" .
 
-FROM --platform=$TARGETPLATFORM alpine:3.20.0 as runtime
+FROM --platform=$TARGETPLATFORM alpine:3.20.3 as runtime
 WORKDIR /linkerd
 RUN apk add \
     # For inotifywait