chore: downgrade basedpyright due to bug

Author: tj098895

pyproject.toml

@@ -58,7 +58,7 @@ dev = [
     "coverage[toml]<8.0.0,>=7.2.5",
     "pytest-xdist<4.0.0,>=3.6.1",
     "inline-snapshot==0.29.2", # Reason: later versions of inline-snapshots makes IDE crash when testing
-    "basedpyright~=1.29",
+    "basedpyright==1.39.0", # Reason: seems to be a bug in 1.39.1 or 1.39.2 wrt. functional operators
     "pytest-split~=0.10.0",
     "pytest-profiling~=1.8.1",
     "pandas-stubs>=3.0.0.260204",