merged changes in axi

fpga/lib/axi/tox.ini

@@ -1,21 +1,23 @@
 # tox configuration
 [tox]
-envlist = py39
+envlist = py3
 skipsdist = True
+minversion = 3.2.0
+requires = virtualenv >= 16.1
 
 [gh-actions]
 python =
-    3.9: py39
+    3.9: py3
 
 [testenv]
 deps =
-    pytest
-    pytest-xdist
-    pytest-split
-    cocotb
-    cocotb-test
-    cocotbext-axi
-    jinja2
+    pytest == 6.2.5
+    pytest-xdist == 2.4.0
+    pytest-split == 0.4.0
+    cocotb == 1.6.1
+    cocotb-test == 0.2.1
+    cocotbext-axi == 0.1.16
+    jinja2 == 3.0.3
 
 commands =
     pytest -n auto {posargs}