Add coverage pragmas to test exception handlers

Author: rodrigobnogueira

tests/test_free_threading.py

@@ -35,7 +35,7 @@ def writer(target: Union[CIMultiDict[str], MultiDict[str]]) -> None:
                 target[f"k-{i % 64}"] = f"v{i}"
             except RuntimeError:
                 pass  # "MultiDict is changed during iteration" is expected
-            except Exception as e:
+            except Exception as e:  # pragma: no cover
                 import traceback
 
                 errors.append(
@@ -52,7 +52,7 @@ def reader(target: Union[CIMultiDict[str], MultiDict[str]]) -> None:
                 # "MultiDict is changed during iteration" is exactly the expected
                 # and memory-safe outcome when iterating a resizing dictionary.
                 pass
-            except Exception as e:
+            except Exception as e:  # pragma: no cover
                 errors.append(("reader", i, type(e).__name__, str(e), ""))
 
     threads = [