There was no need to store team names in secrets, but even when using
explicit team names in the action, it would fail (see GraphqlError at
the end of this commit message).

Also:

- Change the bot ping to @openedx-community-bot
- Removed the /cc mentions in the instruction comment.
- Updated third-party actions to their latest versions.

```
Run tspascoal/[email protected]
Getting teams for nedbat in org openedx. Will check if belongs to open-release-maintainers
GraphqlError: Resource not accessible by integration
    at /home/runner/work/_actions/tspascoal/get-user-teams-membership/v1.0.1/dist/index.js:1:27731
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
    at async run (/home/runner/work/_actions/tspascoal/get-user-teams-membership/v1.0.1/dist/index.js:1:106026) {
  data: { user: { id: 'MDQ6VXNlcjIzNzg5' }, organization: null },
  errors: [
    {
      type: 'FORBIDDEN',
      path: [Array],
      extensions: [Object],
      locations: [Array],
      message: 'Resource not accessible by integration'
    }
  ],
  headers: {
    'access-control-allow-origin': '*',
    'access-control-expose-headers': 'ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Used, X-RateLimit-Resource, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, X-GitHub-SSO, X-GitHub-Request-Id, Deprecation, Sunset',
    connection: 'close',
    'content-encoding': 'gzip',
    'content-security-policy': "default-src 'none'",
    'content-type': 'application/json; charset=utf-8',
    date: 'Wed, 19 Jan 2022 20:00:45 GMT',
    'referrer-policy': 'origin-when-cross-origin, strict-origin-when-cross-origin',
    server: 'GitHub.com',
    'strict-transport-security': 'max-age=31536000; includeSubdomains; preload',
    'transfer-encoding': 'chunked',
    vary: 'Accept-Encoding, Accept, X-Requested-With',
    'x-content-type-options': 'nosniff',
    'x-frame-options': 'deny',
    'x-github-media-type': 'github.v3; format=json',
    'x-github-request-id': '0444:1CAB:51FC03:AE8BC4:61E86DED',
    'x-ratelimit-limit': '1000',
    'x-ratelimit-remaining': '998',
    'x-ratelimit-reset': '1642625635',
    'x-ratelimit-resource': 'graphql',
    'x-ratelimit-used': '2',
    'x-xss-protection': '0'
  },
  name: 'GraphqlError',
  request: {
    query: 'query($cursor: String, $org: String!, $userLogins: [String!], $username: String!)  {\n' +
      '            user(login: $username) {\n' +
      '                id\n' +
      '            }\n' +
      '            organization(login: $org) {\n' +
      '              teams (first:1, userLogins: $userLogins, after: $cursor) { \n' +
      '                  nodes {\n' +
      '                    name\n' +
      '                }\n' +
      '                pageInfo {\n' +
      '                  hasNextPage\n' +
      '                  endCursor\n' +
      '                }        \n' +
      '              }\n' +
      '            }\n' +
      '        }',
    variables: {
      cursor: null,
      org: 'openedx',
      userLogins: [Array],
      username: 'nedbat'
    }
  }
}
Error: Resource not accessible by integration
```