ci(dependabot): add dependabot for github actions

[ArjunSharda]

Summary

This will add dependabot for github actions in .github. This can help with keeping the versions up to date, and providing changelogs for the versions before you merge a PR.

Full changelog

*Adds dependabot for github actions in the .github directory.

Documentation

• Link to the website documentation PR

Testing

N/A (No testing, just made these changes on the GitHub website)

• Unit tests
• E2E tests
• Manual testing on Universal
• Manual testing on Kubernetes

[michaelbeaumont]

Hey, thanks for the PR! Can you add this to the existing .github/dependabot.yml?

[ArjunSharda]

Hey, thanks for the PR! Can you add this to the existing .github/dependabot.yml?

Sure.

[ArjunSharda]

Added on to the dependabot.yml file for the github actions and have did some formattin.

[codecov-commenter]

Codecov Report

Merging #4570 (5a2a9a5) into master (ef44050) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4570   +/-   ##
=======================================
  Coverage   47.05%   47.06%           
=======================================
  Files         677      677           
  Lines       45176    45176           
=======================================
+ Hits        21259    21262    +3     
+ Misses      22049    22046    -3     
  Partials     1868     1868           

Impacted Files	Coverage Δ
pkg/plugins/leader/postgres/leader_elector.go	82.97% <0.00%> (-6.39%)	⬇️
pkg/xds/generator/direct_access_proxy_generator.go	90.90% <0.00%> (+1.13%)	⬆️
pkg/core/resources/manager/cache.go	85.71% <0.00%> (+2.59%)	⬆️
pkg/xds/cache/once/cache.go	89.74% <0.00%> (+7.69%)	⬆️

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[michaelbeaumont]

Thanks!