Fix the type annotation for color param of Spinner.finalize() (#2879)

Closes #2878

Author: kurtmckee

docs/changelog/2878.misc.rst

@@ -0,0 +1 @@
+* Fix an incorrect type annotation for the ``color`` parameter in ``Spinner.finalize()``.

src/tox/util/spinner.py

@@ -138,7 +138,7 @@ def fail(self, key: str) -> None:
     def skip(self, key: str) -> None:
         self.finalize(key, f"SKIP {self.outcome.skip}", Fore.YELLOW)
 
-    def finalize(self, key: str, status: str, color: int) -> None:
+    def finalize(self, key: str, status: str, color: str) -> None:
         start_at = self._envs.pop(key, None)
         if self.enabled:
             self.clear()