Give each try a little more time than the last

Since it has to verify previous work.

Author: EliahKagan

.github/workflows/cygwin-test.yml

@@ -65,7 +65,7 @@ jobs:
         set +e
         for t in {1..5}; do
           echo "Starting try $t."
-          timeout -s KILL 2m pip install ".[test]"
+          timeout -s KILL "$((30 * (t + 1)))"s pip install ".[test]"
           status="$?"
           ((status == 137)) || break
         done