ci: test Flask 3

Add testing for Flask 3.

Author: apotterri

tox.ini

@@ -2,7 +2,7 @@
 isolated_build = true
 # The *-web environments test the latest versions of Django and Flask with the full test suite. For
 # older version of the web frameworks, just run the tests that are specific to them.
-envlist = py3{8,9,10,11,12}-web, py3{8,9,10,11,12}-django3
+envlist = py3{8,9,10,11,12}-{web,django3,flask2}
 
 [testenv]
 allowlist_externals =
@@ -13,7 +13,8 @@ deps=
     poetry
     pytest-django <4.8
     web: Django >=4.0, <5.0
-    web: Flask >= 2, <3
+    web: Flask >=3.0
+    flask2: Flask >= 2.0, <3.0
     django3: Django >=3.2, <4.0
 
 
@@ -24,6 +25,7 @@ commands =
     py310-web: bash -c "poetry run pylint -j 0 appmap _appmap || pylint-exit $?"
     web: poetry run {posargs:pytest}
     django3: poetry run pytest _appmap/test/test_django.py
+    flask2: poetry run pytest _appmap/test/test_flask.py
 
 [testenv:vendoring]
 skip_install = True