Update dependency smol-toml to v1.9.0 (#20138)

Co-authored-by: fisker <lionkay@gmail.com>

tests/unit/config-loader.js

@@ -24,7 +24,14 @@ describe("Support BOM", () => {
       const file = path.join(directory, filename);
       await fs.writeFile(file, `\ufeff${content}`);
       const config = await loadConfig(file);
-      expect(config).toStrictEqual(expected);
+
+      // `smol-toml` uses a `null` prototype object
+      if (filename.endsWith(".toml")) {
+        // eslint-disable-next-line jest/prefer-strict-equal
+        expect(config).toEqual(expected);
+      } else {
+        expect(config).toStrictEqual(expected);
+      }
     });
   }
 });

tests/unit/invalid-config.js

@@ -71,7 +71,7 @@ Cause: Expected property name or '}' in JSON at position 1 (line 1 column 2)"
       loadConfigFile({ filename: ".prettierrc.toml", content: "a=\n  b!=" }),
     ).rejects.toThrowErrorMatchingInlineSnapshot(`
 "TOML Error in "<dir>/.prettierrc.toml":
-Invalid TOML document: incomplete declaration: value expected
+Invalid TOML document: invalid value
 
 1:  a=
       ^