NO-SNOW fix olddriver test by pinning version of pytest-cov (snowflakedb#2357)

Author: sfc-gh-mmishchenko

tox.ini

@@ -82,7 +82,7 @@ deps =
     numpy==1.26.4
     pendulum!=2.1.1
     pytest<6.1.0
-    pytest-cov
+    pytest-cov<6.2.0
     pytest-rerunfailures
     pytest-timeout
     pytest-xdist