Extend deprecation period so that users have 1 entire year

Author: abravalheri

setuptools/dist.py

@@ -507,12 +507,11 @@ def _find_pattern(pattern: str, enforce_match: bool = True) -> list[str]:
             SetuptoolsDeprecationWarning.emit(
                 f"Pattern {pattern!r} cannot contain '..'",
                 """
-                According to the new PyPA standards, this glob pattern is invalid.
                 Please ensure the files specified are contained by the root
                 of the Python package (normally marked by `pyproject.toml`).
                 """,
                 see_url=f"https://packaging.python.org/en/latest/{pypa_guides}",
-                due_date=(2026, 2, 20),  # Introduced in 2025-03-20
+                due_date=(2026, 3, 20),  # Introduced in 2025-03-20
                 # Replace with InvalidConfigError after deprecation
             )
         if pattern.startswith((os.sep, "/")) or ":\\" in pattern:
@@ -525,7 +524,7 @@ def _find_pattern(pattern: str, enforce_match: bool = True) -> list[str]:
                 "Pattern {pattern!r} contains invalid characters.",
                 pattern=pattern,
                 see_url=f"https://packaging.python.org/en/latest/{pypa_guides}",
-                due_date=(2026, 2, 20),  # Introduced in 2025-02-20
+                due_date=(2026, 3, 20),  # Introduced in 2025-02-20
             )
 
         found = glob(pattern, recursive=True)
@@ -535,7 +534,7 @@ def _find_pattern(pattern: str, enforce_match: bool = True) -> list[str]:
                 "Cannot find any files for the given pattern.",
                 "Pattern {pattern!r} did not match any files.",
                 pattern=pattern,
-                due_date=(2026, 2, 20),  # Introduced in 2025-02-20
+                due_date=(2026, 3, 20),  # Introduced in 2025-02-20
                 # PEP 639 requires us to error, but as a transition period
                 # we will only issue a warning to give people time to prepare.
                 # After the transition, this should raise an InvalidConfigError.