Remove cifuzz (#1260)

The existing of the file signifies it needs to run, so now it errors
that there is nothing to run (everything is commented out).

Remove the entire file.

Signed-off-by: Miek Gieben <miek@miek.nl>

.github/workflows/cifuzz.yml

@@ -1,28 +0,0 @@
-#name: CIFuzz
-#on:
-#  pull_request:
-#    branches:
-#      - master
-#    paths:
-#      - '**.go'
-#jobs:
-# Fuzzing:
-#   runs-on: ubuntu-latest
-#   steps:
-#   - name: Build Fuzzers
-#     uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
-#     with:
-#       oss-fuzz-project-name: 'go-dns'
-#       dry-run: false
-#   - name: Run Fuzzers
-#     uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
-#     with:
-#       oss-fuzz-project-name: 'go-dns'
-#       fuzz-seconds: 300
-#       dry-run: false
-#   - name: Upload Crash
-#     uses: actions/upload-artifact@v1
-#     if: failure()
-#     with:
-#       name: artifacts
-#       path: ./out/artifacts