Update pex.yml

Author: ankushdesai

.github/workflows/pex.yml

@@ -32,8 +32,8 @@ jobs:
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
           restore-keys: ${{ runner.os }}-m2
       - name: Build PEx
-        working-directory: Src/PRuntimes/PExRuntime
+        working-directory: Src/PEx
         run: ./scripts/build.sh
       - name: Test PEx
-        working-directory: Src/PRuntimes/PExRuntime
+        working-directory: Src/PEx
         run: mvn test