* Relax version requirements for py-setuptools and enable build for
  older versions of it

* Also relax version requirements for py-google-auth.

--- pyproject.toml.orig	2026-04-23 11:38:22 UTC
+++ pyproject.toml
@@ -1,6 +1,6 @@ build-backend = "setuptools.build_meta"
 [build-system]
 build-backend = "setuptools.build_meta"
-requires = ["setuptools>=78.0.2"]
+requires = ["setuptools>=63.1.0"]
 
 [dependency-groups]
 dev = [
@@ -54,8 +54,7 @@ keywords = ["oauth", "openid", "saml", "social auth"]
 ]
 description = "Python social authentication made simple."
 keywords = ["oauth", "openid", "saml", "social auth"]
-license = "BSD-3-Clause"
-license-files = ["LICENSE"]
+license = { text="BSD-3-Clause" }
 name = "social-auth-core"
 readme = "README.md"
 requires-python = ">=3.10"
@@ -95,7 +94,7 @@ google-onetap = [
   "types-requests==2.33.0.20260408"
 ]
 google-onetap = [
-  "google-auth>=2.40.0,<2.50"
+  "google-auth>=2.40.0,<3"
 ]
 saml = [
   "python3-saml>=1.16.0"