Use --resolution lowest-direct instead of a greenlet version requirement

Author: cjw296

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
           - "3.12"
           - "3.13"
         uv-resolution:
-          - "lowest"
+          - "lowest-direct"
           - "highest"
     steps:
       - uses: actions/checkout@v4

pyproject.toml

@@ -20,12 +20,6 @@ dependencies = [
     "SQLAlchemy-Utils>=0.41"
 ]
 
-[dependency-groups]
-dev = [
-    # https://github.com/sqlalchemy/sqlalchemy/pull/12459:
-    "greenlet>=3.1"
-]
-
 [project.urls]
 Homepage = "http://github.com/toirl/pytest-sqlalchemy/"