fix(deps): update ghcr.io/renovatebot/base-image docker tag to v7.8.7 (#30571)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

tools/docker/Dockerfile

@@ -10,7 +10,7 @@ FROM ghcr.io/renovatebot/base-image:7.8.7@sha256:424ea814c1b8b3baabdd645e8599fa2
 # --------------------------------------
 # full image
 # --------------------------------------
-FROM ghcr.io/renovatebot/base-image:7.8.6-full@sha256:9857a0a3f641233125e19c26581405efb73e72eaf46f6a6fd7f938dc305d959d AS full-base
+FROM ghcr.io/renovatebot/base-image:7.8.7-full@sha256:e983484bc1680056672dc9d82961e034324b19f74e6f82a5ea544bf9a9728d65 AS full-base
 
 # --------------------------------------
 # build image