Require text JuliaRegistries/TagBot in tag_bot.yml

JuliaTagBot requires one of the workflow files to have text
JuliaRegistries/TagBot to makesure it is being called. Since we are
using reusable workflows, this text is not mentioned in the calling
action file. Thus added a comment that has this text in it.

See JuliaRegistries/TagBot#382 (comment)
for more details.

Author: anchal-physics

.github/workflows/tag_bot.yml

@@ -11,3 +11,4 @@ jobs:
   TagBot:
     uses: ProjectTorreyPines/GitHubActionsWorkflows/.github/workflows/tag_bot.yml@master
     secrets: inherit
+    # This action uses JuliaRegistries/TagBot to tag the registered version on Github.