restore python 3.7 support

This needs to be enabled for the package lint job to pass. The 3.7
jobs do not have to pass for Mergify to accept the PR.

Author: dhellmann

.github/workflows/test.yml

@@ -16,6 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version:
+          - 3.7
           - 3.8
           - 3.9
           - "3.10"

pyproject.toml

@@ -13,6 +13,7 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
@@ -27,7 +28,7 @@ dynamic = ["version"]
 keywords = ["virtualenv"]
 license = {text = "MIT"}
 readme = "README.txt"
-requires-python = ">=3.8"
+requires-python = ">=3.7"
 
 dependencies = [
     "virtualenv",