re-enable CI-fuzzing

It was recently fixed, see google/oss-fuzz#12168 (comment) for details.

Author: Byron

.github/workflows/cifuzz.yml

@@ -0,0 +1,24 @@
+name: CIFuzz
+on: [pull_request]
+jobs:
+ Fuzzing:
+   runs-on: ubuntu-latest
+   steps:
+   - name: Build Fuzzers
+     id: build
+     uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
+     with:
+       oss-fuzz-project-name: 'gitoxide'
+       language: rust
+   - name: Run Fuzzers
+     uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
+     with:
+       oss-fuzz-project-name: 'gitoxide'
+       language: rust
+       fuzz-seconds: 600
+   - name: Upload Crash
+     uses: actions/upload-artifact@v4
+     if: failure() && steps.build.outcome == 'success'
+     with:
+       name: artifacts
+       path: ./out/artifacts