Bump debian from bullseye-20250520-slim to bullseye-20250610-slim in /lambdas/thumbnail (#4416)

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-20250520-slim@sha256:2f2307d7c75315ca7561e17a4e3aa95d58837f326954af08514044e8286e6d65 as base-image
+FROM debian:bullseye-20250610-slim@sha256:779034981fec838da124ff6ab9211499ba5d4e769dabdfd6c42c6ae2553b9a3b as base-image
 
 FROM base-image as build-image