Try finding lit executable through uv

Author: rolfmorel

.github/workflows/examples.yml

@@ -26,5 +26,5 @@ jobs:
       - name: Run lit-enabled examples as tests
         run: |
           export FILECHECKPATH=FileCheck-18 # Ubuntu's llvm-dev appends a version number.
-          lit python/examples  # Makes sure to substitute FileCheck for $FILECHECKPATH
+          uv run lit python/examples  # Makes sure to substitute FileCheck for $FILECHECKPATH