Lock drivers-evergreen-tools to a working version

Author: GromNaN

.github/workflows/tests.yml

@@ -63,7 +63,7 @@ jobs:
           submodules: true
 
       - id: setup-mongodb
-        uses: mongodb-labs/drivers-evergreen-tools@master
+        uses: mongodb-labs/drivers-evergreen-tools@50f50f9c039b4f13932e4d26c3cea1e1a732f881
         with:
           version: ${{ matrix.mongodb-version }}
           topology: ${{ matrix.topology }}