Update Github Action to use pull_request event vs. pull_request_target

[brandongregoryscott]

Fixes #211 Github Actions - skip PR or merge builds from all-contributors bot

• [x] Related GitHub issue(s) linked in PR description
• [x] Destination branch merged, built and tested with your changes
• [x] Code formatted and follows best practices and patterns
• [x] Code builds cleanly (no additional warnings or errors)
• [x] Manually tested
  • Tested on my own fork vs. intentionally broken PR https://github.com/brandongregoryscott/AndcultureCode.Cli/pull/5
• [-] Automated tests are passing
• [-] No decreases in automated test coverage
• [-] Documentation updated (readme, docs, comments, etc.)
• [-] Localization: No hard-coded error messages in code files (minimally in string constants)