Avoid boolean trap in search_issues

We now require json_result and use_post are passed as keyword arguments,
satisfying type checker requirements and handling the default return
value correctly.

jira/client.py

@@ -3495,6 +3495,7 @@ def search_issues(
         fields: str | list[str] | None = "*all",
         expand: str | None = None,
         properties: str | None = None,
+        *,
         json_result: Literal[False] = False,
         use_post: bool = False,
     ) -> ResultList[Issue]: ...
@@ -3509,7 +3510,8 @@ def search_issues(
         fields: str | list[str] | None = "*all",
         expand: str | None = None,
         properties: str | None = None,
-        json_result: Literal[True] = True,
+        *,
+        json_result: Literal[True],
         use_post: bool = False,
     ) -> dict[str, Any]: ...
 
@@ -3522,6 +3524,7 @@ def search_issues(
         fields: str | list[str] | None = "*all",
         expand: str | None = None,
         properties: str | None = None,
+        *,
         json_result: bool = False,
         use_post: bool = False,
     ) -> dict[str, Any] | ResultList[Issue]: