No need to upgrade firefox (#293)

Author: christophfroehlich

.github/workflows/reusable-ros-tooling-source-build.yml

@@ -43,7 +43,7 @@ jobs:
         id: prereq
         run: |
           command -v sudo >/dev/null 2>&1 || (apt update && apt install -y sudo)
-          DEBIAN_FRONTEND=noninteractive sudo apt update && sudo apt upgrade -y
+          DEBIAN_FRONTEND=noninteractive sudo apt update && sudo apt-mark hold firefox && sudo apt upgrade -y
           echo "need_node=$(command -v node >/dev/null 2>&1 && echo 0 || echo 1)" >> $GITHUB_OUTPUT
 
       # needed for github actions, and only if a bare ubuntu image is used