Drop support for python3.7

`referencing` does not support 3.7, which means that supporting 3.7
would start to require separate compatibility code precisely when it
has just reached EOL (4 weeks ago at time of writing).

Drop 3.7 and move the 'mindeps' builds to 3.8

Author: sirosen

.github/workflows/build.yaml

@@ -11,7 +11,7 @@ jobs:
         py: ["3.x"]
         include:
           - toxenv: py-mindeps
-            py: "3.7"
+            py: "3.8"
 
     runs-on: ubuntu-latest
     name: "Run '${{ matrix.toxenv }}' on python ${{ matrix.py }}"
@@ -40,7 +40,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        py: ['3.7', '3.8', '3.9', '3.10', '3.11']
+        py: ['3.8', '3.9', '3.10', '3.11']
     name: "Run tests on ${{ matrix.os }}, py${{ matrix.py }}"
     runs-on: ${{ matrix.os }}
     steps:

tox.ini

@@ -2,10 +2,10 @@
 envlist =
     mypy
     cov_clean
-    py37-mindeps
-    py{311,310,39,38,37}
+    py38-mindeps
+    py{311,310,39,38}
     py310-{notoml,tomli-format}
-    py{37,311}-{json5,pyjson5}
+    py{38,311}-{json5,pyjson5}
     cov
 skip_missing_interpreters = true
 minversion = 4.0.0
@@ -18,7 +18,7 @@ description = "run tests with pytest"
 usedevelop = true
 extras = dev
 deps =
-    mindeps: jsonschema==4.5.1
+    mindeps: jsonschema==4.18.0
     mindeps: click==8.0.0
     mindeps: requests==2.0.0
     mindeps: importlib-resources==1.4.0