Fix lexing single-quoted f-string with multi-line format spec (#7787)

## Summary

Reported at https://github.com/python/cpython/issues/110259

## Test Plan

Add test cases for the fix and update the snapshots

crates/ruff_python_parser/src/parser.rs

@@ -1290,6 +1290,11 @@ match foo:
 
 f"\{foo}\{bar:\}"
 f"\\{{foo\\}}"
+f"""{
+    foo:x
+        y
+        z
+}"""
 "#
             .trim(),
             "<test>",