Use token in spelling workflow

[walkowif]

PR created to address the following errors when spelling workflow is run on main:

remote: error: GH006: Protected branch update failed for refs/heads/main.        
remote: error: Changes must be made through a pull request. Required status check "R CMD Check 🧬 / ghcr.io/insightsengineering/rstudio_4.3.1_bioc_3.17, version latest" is expected.        
To https://github.com/insightsengineering/rlistings
 ! [remote rejected] main -> main (protected branch hook declined)

remote: error: GH006: Protected branch update failed for refs/heads/main.        
remote: error: Changes must be made through a pull request.        
To https://github.com/insightsengineering/random.cdisc.data
 ! [remote rejected] main -> main (protected branch hook declined)

[github-actions]

Unit Tests Summary

3 tests   3 ✔️  8s ⏱️
3 suites  0 💤
1 files    0 ❌

Results for commit 86a717a.