deps: Update debian:buster Docker digest to cca6bcc (#1777)

Co-authored-by: Eno Compton <[email protected]>

Dockerfile.buster

@@ -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.buster"
 
 # Final stage
-FROM debian:buster@sha256:173f0b19d2ac5ee17194dbe9a888a4a617dbf905ee666c9e780afad55eaf1d8c
+FROM debian:buster@sha256:cca6bcced970f7634197ff1821aabb452024eb437958ab98bfc146ece96969c6
 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