fix typer not supporting | type

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "requirements_compare"
-version = "0.1.2"
+version = "0.1.3"
 authors = [
     { name = "Dorian Turba", email = "contact.r9qrp@8shield.net" },
     { name = "Simon Desnoyers", email = "0d3s3n@gmail.com"},
@@ -26,7 +26,6 @@ dependencies = [
     "typer[all]",
 ]
 
-
 [project.urls]
 "Homepage" = "https://lab.frogg.it/swepy/requirement-compare"
 "Bug Tracker" = "https://lab.frogg.it/swepy/requirement-compare"

src/requirements_compare/main.py

@@ -154,8 +154,9 @@ def main(
         pathlib.Path, typer.Argument(help="The updated requirements file to compare")
     ],
     output_file: typing.Annotated[
-        pathlib.Path | None, typer.Argument(help="Where to write the output")
-    ] = None,
+        pathlib.Path, typer.Argument(help="Where to write the output")
+    ]
+    | None = None,
 ) -> None:
     """
     Compare a local requirements file to its HEAD version and generate a description of