deps: Update debian:bullseye Docker digest to a4aa051 (#2015)

Dockerfile.bullseye

@@ -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.bullseye"
 
 # Final stage
-FROM debian:bullseye@sha256:c141beaa9e0767774221cc82efe3a6712a1cc4f75d2699334dfd9a28a6f7357b
+FROM debian:bullseye@sha256:a4aa0519fbd45786048bbc4daa7092fec803d22463f1cb6c4e7762dcb6a10cf0
 RUN apt-get update && apt-get install -y ca-certificates
 # Install fuse and allow enable non-root users to mount
 RUN apt-get update && apt-get install -y fuse && sed -i 's/^#user_allow_other$/user_allow_other/g' /etc/fuse.conf