Bug fix for "Member Activity Trigger" using pull_request_target

[t-will-gillis]

Fixes #8309

What changes did you make?

• In activity-trigger.yml, changed trigger to pull_request_target
• Same file, added default permissions
• In post-to-skills-issue.js, increased the default per_page from 30 to 100

Why did you make the changes (we will use this info to test)?

• pull_request trigger does not run against current code and causes an error
• These permissions are explicitly defining the workflow permissions
• Sometimes the bot comment will be greater than 30 deep. 100 is the maximum without going to pagination, but this should be adequate.
• Added the explicit semicolon for the dependabot.

Note that because this PR affects the workflow itself, the workflow will not be triggered.

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Screenshots of Proposed Changes To The Website (if any, please do not include screenshots of code changes)

• No visual changes

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From your project repository, check out a new branch and test the changes.

git checkout -b t-will-gillis-bug-fix-member-activity-8309 gh-pages
git pull https://github.com/t-will-gillis/website.git bug-fix-member-activity-8309

[t-will-gillis]

Merging this immediately because otherwise the workflow will be missing events until merged.