fix typo

Author: galabovaa

.github/workflows/extra-unit-tests.yml

@@ -60,7 +60,7 @@ jobs:
       - name: Configure CMake
         shell: bash
         working-directory: ${{runner.workspace}}/build
-        run: cmake $${{runner.workspace}}/highs-tests/HiGHS -DALL_TESTS=ON -DBUILD_EXTRA_UNIT_TESTS=ON
+        run: cmake ${{runner.workspace}}/highs-tests/HiGHS -DALL_TESTS=ON -DBUILD_EXTRA_UNIT_TESTS=ON
 
       - name: Build
         working-directory: ${{runner.workspace}}/build