Cleanup stale Python3.9 dependencies (#52344)

Author: eladkal

airflow-core/pyproject.toml

@@ -78,9 +78,6 @@ dependencies = [
     "cryptography>=41.0.0",
     "deprecated>=1.2.13",
     "dill>=0.2.2",
-    # Required for python 3.9 to work with new annotations styles. Check package
-    # description on PyPI for more details: https://pypi.org/project/eval-type-backport/
-    'eval-type-backport>=0.2.0;python_version<"3.10"',
     # 0.115.10 fastapi was a bad release that broke our API's and static checks.
     # Related fastapi issue here: https://github.com/fastapi/fastapi/discussions/13431
     "fastapi[standard]>=0.115.0,!=0.115.10",
@@ -95,8 +92,7 @@ dependencies = [
     "jinja2>=3.1.5",
     "jsonschema>=4.19.1",
     "lazy-object-proxy>=1.2.0",
-    'libcst >=1.1.0,!=1.8.1;python_version<"3.10"',
-    'libcst >=1.1.0;python_version>="3.10"',
+    'libcst >=1.1.0',
     "linkify-it-py>=2.0.0",
     "lockfile>=0.12.2",
     "methodtools>=0.4.7",