tests: drop py2 support from `filtertraceback.py`

tests/filtertraceback.py

@@ -6,15 +6,14
 import io
 import sys
 
-if sys.version_info[0] >= 3:
-    # Prevent \r from being inserted on Windows.
-    sys.stdout = io.TextIOWrapper(
-        sys.stdout.buffer,
-        sys.stdout.encoding,
-        sys.stdout.errors,
-        newline="\n",
-        line_buffering=sys.stdout.line_buffering,
-    )
+# Prevent \r from being inserted on Windows.
+sys.stdout = io.TextIOWrapper(
+    sys.stdout.buffer,
+    sys.stdout.encoding,
+    sys.stdout.errors,
+    newline="\n",
+    line_buffering=sys.stdout.line_buffering,
+)
 
 state = 'none'