chore(deps): update gentoo/stage3:latest docker digest to 4e9f9ab (#2517)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: bitcoin-tools

docker/Dockerfile_gentoo

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 # Gentoo is known for its customization, optimization at the expense of image build time.asdf
 # This Dockerfile offers a stable base image but takes extra time to compile all dependencies.
-FROM gentoo/stage3:latest@sha256:c4b3f7dc13c5161cc250183d19879184f55dd1cd23b1bb676f00f773acfee65a
+FROM gentoo/stage3:latest@sha256:4e9f9abb123542925353417fb7116ec981989cdfc5b9871f5a40969482e05ec3
 
 # Set the terminal type to Xterm.
 ENV TERM=xterm