update clang format action

Author: tgymnich

.github/workflows/format.yml

@@ -9,9 +9,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - uses: DoozyX/clang-format-lint-action@v0.11
+    - uses: DoozyX/clang-format-lint-action@v0.15
       with:
         source: 'enzyme/Enzyme'
         exclude: './CMakeLists.txt enzyme/Enzyme/SCEV'
         style: 'llvm'
-        clangFormatVersion: 11
+        clangFormatVersion: 15