Added some links to some of the newer TILs

README.md

@@ -435,6 +435,9 @@
 - [Use Dependabot for Ruby](github_actions/use_dependabot_for_ruby.md)
 - [Use Dependabot for Python](github_actions/use_dependabot_for_python.md)
 - [Detect What Files Have Changed](github_actions/detect_what_files_have_changed.md)
+- [Pin Your Action Dependencies](github_actions/pin_your_action_dependencies.md)
+- [How do I resolved the SHA checksums](github_actions/how_do_i_resolved_the_sha_checksums.md)
+- [Use checkout action](github_actions/use_checkout.md)
 
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 ### GnuPG - PGP tools, GNU variant