Bump the version of llvm that clang tidy runs against to 20 (#372)

Author: mcbarton

.github/workflows/clang-tidy-review.yml

@@ -25,9 +25,9 @@ jobs:
           python-version: "3.11"
 
       - name: Install LLVM and Clang
-        uses: KyleMayes/install-llvm-action@v2.0.3
+        uses: KyleMayes/install-llvm-action@v2
         with:
-          version: "17.0.6"
+          version: "20"
 
       - name: Run clang-tidy
         uses: ZedThree/[email protected]