Add exclude lines to .coveragerc to account for a) `if t.TYPE_CHECKIN…

…G` blocks and b) lines that are only ellipses, as well as some temporary pragma comments in _typing_compat.py. This seems to account for most of the missing coverage with the current configuration, excluding line 447 in validators.py.

.coveragerc

@@ -3,4 +3,6 @@ exclude_lines =
     .* # Python \d.*
     .* # nocov: Python \d.*
     .* # pragma: no cover.*
+    ^\s*(?:el)?if t\.TYPE_CHECKING:$
+    ^ +\.\.\.$
 fail_under = 100

src/rfc3986/_typing_compat.py

@@ -3,11 +3,11 @@
 
 __all__ = ("Self",)
 
-if sys.version_info >= (3, 11):
+if sys.version_info >= (3, 11):  # pragma: no cover
     from typing import Self
 elif t.TYPE_CHECKING:
     from typing_extensions import Self
-else:
+else:  # pragma: no cover
 
     class _PlaceholderMeta(type):
         # This is meant to make it easier to debug the presence of placeholder