fix(fuzzing): revert to old container image

The v1.17.0-rc2 container's clang 18 + cmake 3.28 combination fails
abseil's cmake try_compile tests for C++17 and pthreads. This breaks
the fuzztest build which depends on abseil. Verified locally:

- px4io/px4-dev:v1.16.0-rc2 + apt install clang: cmake configure passes
- ghcr.io/px4/px4-dev:v1.17.0-rc2 (clang 18 pre-installed): cmake
  configure fails with "ABSL_INTERNAL_AT_LEAST_CXX17 - Failed" and
  "Could NOT find Threads"
- apt install clang on v1.17.0-rc2 is a no-op (already installed)

Revert to the old container image which has a working clang+cmake
combination. The apt install clang step (already in the workflow)
installs clang on the old container which doesn't ship it by default.

Remove the explicit fetch-depth: 0 added in the previous fix attempt
since the original workflow used the default depth (1) and it worked.

Fixes #27060

Signed-off-by: Ramon Roche <mrpollo@gmail.com>

.github/workflows/fuzzing.yml

@@ -14,17 +14,18 @@ jobs:
   Fuzzing:
     runs-on: [runs-on,runner=4cpu-linux-x64,image=ubuntu24-full-x64,"run-id=${{ github.run_id }}",spot=false,extras=s3-cache]
     container:
-      image: ghcr.io/px4/px4-dev:v1.17.0-rc2
+      image: px4io/px4-dev:v1.16.0-rc2-4-gb67c65bfe6
     steps:
       - uses: runs-on/action@v2
 
       - uses: actions/checkout@v6
-        with:
-          fetch-depth: 1
 
       - name: Configure Git Safe Directory
         run: git config --system --add safe.directory '*'
 
+      - name: Install clang
+        run: apt-get update && apt-get install -y clang
+
       - uses: ./.github/actions/setup-ccache
         id: ccache
         with: