PYTHON-4861 Fix HATCH_CONFIG on cygwin (mongodb#1927)

Author: ShaneHarvey

.evergreen/hatch.sh

@@ -29,6 +29,9 @@ else # Set up virtualenv before installing hatch
     # Ensure hatch does not write to user or global locations.
     touch hatch_config.toml
     HATCH_CONFIG=$(pwd)/hatch_config.toml
+    if [ "Windows_NT" = "$OS" ]; then # Magic variable in cygwin
+        HATCH_CONFIG=$(cygpath -m "$HATCH_CONFIG")
+    fi
     export HATCH_CONFIG
     hatch config restore
     hatch config set dirs.data ".hatch/data"