Update comment on GH PAT for runners

[canton-network-da]

[static]

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[isegall-da]

(whoops, that was me, still logged in as the SA)

[isegall-da]

I also deleted the outdated PAT in GH, and nothing broke AFAICT

[OriolMunoz-da]

Thanks!

[martinflorian-da]

@isegall-da Any reason not to merge?