[ruff] Skip SQLModel base classes for mutable-class-default (RUF012) (#14949)

## Summary

Closes https://github.com/astral-sh/ruff/issues/14892, by adding
`sqlmodel.SQLModel` to the list of classes with default copy semantics.

## Test Plan

Added a test into `RUF012.py` containing the example from the original
issue.

crates/ruff_linter/resources/test/fixtures/ruff/RUF012.py

@@ -79,3 +79,27 @@ class H(BaseModel):
         without_annotation = []
         class_variable: ClassVar[list[int]] = []
         final_variable: Final[list[int]] = []
+
+
+def sqlmodel_import_checker():
+    from sqlmodel.main import SQLModel
+
+    class I(SQLModel):
+        id: int
+        mutable_default: list[int] = []
+
+from sqlmodel import SQLModel
+
+class J(SQLModel):
+    id: int
+    name: str
+
+
+class K(SQLModel):
+    id: int
+    i_s: list[J] = []
+
+
+class L(SQLModel):
+    id: int
+    i_j: list[K] = list()

crates/ruff_linter/src/rules/ruff/rules/helpers.rs

@@ -187,6 +187,7 @@ pub(super) fn has_default_copy_semantics(
             ["pydantic", "BaseModel" | "BaseSettings" | "BaseConfig"]
                 | ["pydantic_settings", "BaseSettings"]
                 | ["msgspec", "Struct"]
+                | ["sqlmodel", "SQLModel"]
         )
     })
 }

crates/ruff_linter/src/rules/ruff/snapshots/ruff_linter__rules__ruff__tests__RUF012_RUF012.py.snap

@@ -1,5 +1,6 @@
 ---
 source: crates/ruff_linter/src/rules/ruff/mod.rs
+assertion_line: 82
 snapshot_kind: text
 ---
 RUF012.py:9:34: RUF012 Mutable class attributes should be annotated with `typing.ClassVar`
@@ -31,3 +32,13 @@ RUF012.py:25:26: RUF012 Mutable class attributes should be annotated with `typin
 26 |     perfectly_fine: list[int] = field(default_factory=list)
 27 |     class_variable: ClassVar[list[int]] = []
    |
+
+RUF012.py:89:38: RUF012 Mutable class attributes should be annotated with `typing.ClassVar`
+   |
+87 |     class I(SQLModel):
+88 |         id: int
+89 |         mutable_default: list[int] = []
+   |                                      ^^ RUF012
+90 | 
+91 | from sqlmodel import SQLModel
+   |