[CI] gap9-w-ne16-tiled: mark workspace safe (match other runner workflows)

The NE16 CI runs on ecab71e and 7f6ce26 tripped on git's "dubious
ownership" check for TargetLibraries/CMSIS/third_party/CMSIS-NN during
submodule fetch, killing the job before any pytest started. The CMSIS-NN
submodule SHA hasn't changed since 822dd32 (where this workflow last
passed), so this is purely a runner workspace-ownership issue.

Add the same Mark workspace as safe step that every other platform's
_runner-*.yml already uses (siracusa, snitch, gap9, gap9-tiled, chimera,
generic, cortexm, mempool, siracusa-neureka-tiled, ...).

Author: runwangdl

.github/workflows/_runner-gap9-w-ne16-tiled.yml

@@ -24,6 +24,8 @@ jobs:
     container:
       image: ${{ inputs.docker-image }}
     steps:
+      - name: Mark workspace as safe
+        run: git config --global --add safe.directory '*'
       - name: Checkout Repo
         uses: actions/checkout@v4
         with: