Figure.timestamp: Remove deprecated parameter 'justification', use justify instead (deprecated since v0.11.0) (#3222)

Author: michaelgrund

pygmt/src/timestamp.py

@@ -9,7 +9,7 @@
 
 from packaging.version import Version
 from pygmt.clib import Session, __gmt_version__
-from pygmt.helpers import build_arg_list, deprecate_parameter, kwargs_to_strings
+from pygmt.helpers import build_arg_list, kwargs_to_strings
 
 if TYPE_CHECKING:
     from collections.abc import Sequence
@@ -18,7 +18,6 @@
 __doctest_skip__ = ["timestamp"]
 
 
-@deprecate_parameter("justification", "justify", "v0.11.0", remove_version="v0.13.0")
 @kwargs_to_strings(offset="sequence")
 def timestamp(
     self,