Add latest flask 2.x release to CI runs

Author: vimalloc

.github/workflows/unit_tests.yml

@@ -20,7 +20,9 @@ jobs:
           python-version: ${{ matrix.python }}
       - name: Install Dependencies
         run: pip install tox
-      - name: Run Tox
+      - name: Run Tox Flask==3.x
         run: tox -e py
       - name: Run Tox Flask==2.1
         run: tox -e flask21
+      - name: Run Tox Flask==2.x
+        run: tox -e flask2x

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py37,py38,py39,py310,py311,py312,pypy3.9,flask21,mypy,coverage,style,docs
+envlist = py37,py38,py39,py310,py311,py312,pypy3.9,flask21,flask2x,mypy,coverage,style,docs
 
 [testenv]
 commands =
@@ -15,6 +15,8 @@ deps =
   python-dateutil
   flask21: Flask>=2.1,<2.2
   flask21: Werkzeug>=2,<3
+  flask2x: Flask<3.0
+  flask2x: Werkzeug>=2,<3
 
 [testenv:mypy]
 commands =