merged mypy and ruff environments for less space

tox.ini

@@ -1,11 +1,11 @@
 [tox]
 min_version = 4.0
-envlist = pytest, ruff, mypy
+envlist = pytest, ruff_and_mypy
 isolated_build = true
 
 [gh-actions]
 python =
-    3.10: pytest, mypy, ruff
+    3.10: pytest, ruff_and_mypy
 
 [testenv]
 setenv =
@@ -18,13 +18,12 @@ deps =
 commands =
     pytest 
     ; --basetemp={envtmpdir}
-
-[testenv:ruff]
-basepython = python3.10
-deps = ruff
-commands = ruff check src tests --exit-zero
 
-[testenv:mypy]
+[testenv:ruff_and_mypy]
 basepython = python3.10
-deps = mypy
-commands = - mypy src --exclude tunit  # ignore tunit for now
+deps = 
+    ruff
+    mypy
+commands = 
+    ruff check src tests --exit-zero
+    - mypy src --exclude tunit  # ignore tunit for now