Bump debian from bullseye-20240812-slim to bullseye-20240904-slim in /lambdas/thumbnail (#4131)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

lambdas/thumbnail/Dockerfile

@@ -1,6 +1,6 @@
 ARG FUNCTION_DIR="/function"
 
-FROM debian:bullseye-20240812-slim@sha256:9058862a1be84689bd13292549ba981364f85ff99e50a612f94b188ac69db137 as base-image
+FROM debian:bullseye-20240904-slim@sha256:00558f781b91e90469812bad32002f311ab26ef241b4a1996f6600680ec82f5c as base-image
 
 FROM base-image as build-image