Bump alpine from 3.19.1 to 3.20.0

Bumps alpine from 3.19.1 to 3.20.0.

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

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

Dockerfile

@@ -5,7 +5,7 @@ WORKDIR /app
 COPY . /app/
 RUN CGO_ENABLED=0 go build -o bin/smartmeter ./cmd/smartmeter
 
-FROM alpine:3.19.1
+FROM alpine:3.20.0
 RUN apk --update add ca-certificates
 RUN mkdir /app
 WORKDIR /app