deps: Update alpine:3 Docker digest to 5b10f43 (GoogleCloudPlatform#2585)

Author: renovate-bot

Dockerfile.alpine

@@ -26,7 +26,7 @@ RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} \
     go build -ldflags "-X github.com/GoogleCloudPlatform/cloud-sql-proxy/v2/cmd.metadataString=container.alpine"
 
 # Final stage
-FROM alpine:3@sha256:4d889c14e7d5a73929ab00be2ef8ff22437e7cbc545931e52554a7b00e123d8b
+FROM alpine:3@sha256:5b10f432ef3da1b8d4c7eb6c487f2f5a8f096bc91145e68878dd4a5019afde11
 
 LABEL org.opencontainers.image.source="https://github.com/GoogleCloudPlatform/cloud-sql-proxy"