fix: Replace unsigned types in job queue definition

- priority: uint8 → int8
- pid: uint32 → int32
- connection_id: uint64 → int64

Ensures job queue uses only core signed integer types.

Author: dimitri-yatsenko

src/datajoint/jobs.py

@@ -155,7 +155,7 @@ def _generate_definition(self) -> str:
     {pk_lines}
     ---
     status          : enum('pending', 'reserved', 'success', 'error', 'ignore')
-    priority        : uint8
+    priority        : int8
     created_time=CURRENT_TIMESTAMP(3) : datetime(3)
     scheduled_time=CURRENT_TIMESTAMP(3) : datetime(3)
     reserved_time=null  : datetime(3)
@@ -165,8 +165,8 @@ def _generate_definition(self) -> str:
     error_stack=null : <blob>
     user=""         : varchar(255)
     host=""         : varchar(255)
-    pid=0           : uint32
-    connection_id=0 : uint64
+    pid=0           : int32
+    connection_id=0 : int64
     version=""      : varchar(64)
     """