fix(nvm): do not attempt to pin node digest for nvm (#8215)

Co-authored-by: Rhys Arkins <rhys@arkins.net>

lib/manager/nvm/index.ts

@@ -8,4 +8,5 @@ export const language = LANGUAGE_NODE;
 export const defaultConfig = {
   fileMatch: ['(^|/)\\.nvmrc$'],
   versioning: nodeVersioning.id,
+  pinDigests: false,
 };