Change Authorization header type for API requests from "token" to "…

…Bearer"

The authorization type "Bearer" is more widely recognized than "token". E.g. Gitlab requires that you use "Bearer".
This should fix #7172 where apparently login with Github was broken by this line: #7172 (comment)
See also: #5844 (comment)

packages/decap-cms-lib-util/src/API.ts

@@ -182,7 +182,7 @@ async function constructRequestHeaders(headerConfig: HeaderConfig) {
  const { token, headers } = headerConfig;
  const baseHeaders: HeaderObj = { 'Content-Type': 'application/json; charset=utf-8', ...headers };
  if (token) {
- baseHeaders['Authorization'] = `token ${token}`;
+ baseHeaders['Authorization'] = `Bearer ${token}`;
  }
  return Promise.resolve(baseHeaders);
 }