Fix lint script hanging on import check in CI

rye run python hangs indefinitely in CI after pyright completes.
Using .venv/bin/python directly avoids the rye subprocess wrapper
that causes the hang.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: atanasiuk-hubspot

scripts/lint

@@ -13,4 +13,4 @@ else
 fi
 
 echo "==> Making sure it imports"
-rye run python -c 'import hubspot_sdk'
+.venv/bin/python -c 'import hubspot_sdk'