fix(mise): add config filenames (#30283)

lib/modules/manager/mise/index.ts

@@ -5,7 +5,7 @@ export { extractPackageFile } from './extract';
 export const displayName = 'mise';
 
 export const defaultConfig = {
-  fileMatch: ['(^|/)\\.mise\\.toml$'],
+  fileMatch: ['(^|/)\\.?mise\\.toml$', '(^|/)\\.?mise/config\\.toml$'],
 };
 
 // Re-use the asdf datasources, as mise and asdf support the same plugins.

lib/modules/manager/mise/readme.md

@@ -7,7 +7,7 @@ Renovate's `mise` manager can version these tools:
 
 ### Renovate only updates primary versions
 
-Renovate's `mise` manager is designed to automatically update the _first_ (primary) version listed for each tool in the `mise.toml` file.
+Renovate's `mise` manager is designed to automatically update the _first_ (primary) version listed for each tool in the `.mise.toml` file.
 
 Secondary or fallback versions require manual updates.