ci: disable mitproxy from primer

Author: KotlinIsland

.github/workflows/mypy_primer.yml

@@ -66,7 +66,7 @@ jobs:
             --output concise \
             `# We don't want to run on spack because it has massive inferred types` \
             `#  https://github.com/KotlinIsland/basedmypy/issues/399` \
-            --project-selector "^(?!https://github.com/spack/spack)" \
+            --project-selector "^(?!https://github.com/(spack/spack|mitmproxy/mitmproxy))" \
             | tee diff_${{ matrix.shard-index }}.txt
           ) || [ $? -eq 1 ]
       - name: Upload mypy_primer diff