Rename Tables to Table in teradata config models

Author: vivek-datadog

teradata/datadog_checks/teradata/config_models/instance.py

@@ -42,7 +42,7 @@ class MetricPatterns(BaseModel):
     include: Optional[tuple[str, ...]] = None
 
 
-class Tables(BaseModel):
+class Table(BaseModel):
     model_config = ConfigDict(
         arbitrary_types_allowed=True,
         frozen=True,