Drop Python 3.7 support.

Author: mblondel

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.8", "3.9", "3.10"]
         os: [ubuntu-latest]
 
     steps:

setup.py

@@ -56,11 +56,10 @@
         "Topic :: Scientific/Engineering :: Artificial Intelligence",
         "License :: OSI Approved :: Apache Software License",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
     ],
     keywords="optimization, root finding, implicit differentiation, jax",
-    requires_python=">=3.7",
+    requires_python=">=3.8",
 )