Avoid usage of pipe symbol in type hints

Author: ctrueden

src/scyjava/_cjdk_fetch.py

@@ -4,7 +4,7 @@
 import os
 import shutil
 import subprocess
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Union
 
 import jpype
 
@@ -118,7 +118,7 @@ def cjdk_fetch_maven(url: str = "", sha: str = "", raise_on_error: bool = True)
         raise RuntimeError("Failed to find Maven executable in the downloaded package.")
 
 
-def _add_to_path(path: Path | str, front: bool = False) -> None:
+def _add_to_path(path: Union[Path, str], front: bool = False) -> None:
     """Add a path to the PATH environment variable.
 
     If front is True, the path is added to the front of the PATH.

src/scyjava/_jvm.py

@@ -11,6 +11,7 @@
 from functools import lru_cache
 from importlib import import_module
 from pathlib import Path
+from typing import Optional
 
 import jpype
 import jpype.config
@@ -106,7 +107,7 @@ def jvm_version() -> str:
     return tuple(map(int, m.group(1).split(".")))
 
 
-def start_jvm(options=None, *, fetch_java: bool | None = None) -> None:
+def start_jvm(options=None, *, fetch_java: Optional[bool] = None) -> None:
     """
     Explicitly connect to the Java virtual machine (JVM). Only one JVM can
     be active; does nothing if the JVM has already been started. Calling