Update alpine Docker tag to v3.23 (#40)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Dockerfile

@@ -16,7 +16,7 @@ COPY . .
 
 RUN CGO_ENABLED=0 go build -o webhook -ldflags '-w -extldflags "-static"' .
 
-FROM alpine:3.22
+FROM alpine:3.23
 
 RUN apk add --no-cache ca-certificates