Fix PR tests for python >3.8

There seems to be a bug with newer versions of pandas that prevents
kwargs from being passed through the apply function (specifically
passing errors='ignore' to to_numeric in edalize/vivado_reporting.py).
Pinning pandas to v2.0.3 appears to have fixed the issue for now.

I also added GOLDEN_RUN to pass through to tox.

tox.ini

@@ -2,6 +2,9 @@
 envlist = py3
 
 [testenv]
-deps = pytest
+deps =
+    pytest
+    pandas==2.0.3
 extras = reporting
 commands = pytest {posargs}
+passenv = GOLDEN_RUN