📖 Update links that were pointing to the master branch of amp-github-apps

[rsimha]

This PR updates all links in amphtml documentation that were pointing to the master branch of the amp-github-apps repo to use main instead. It can be merged at leisure after the branch is renamed (see this plan), because GitHub links are auto-redirected.

Sending this out for review and owners approval. On self-review, this PR changes only the documentation comments in our OWNERS files, so it should be fairly safe to merge after the branch rename. (Won't merge until after the rename is complete.)

Partial fix for #32195

[amp-owners-bot]

Hey @erwinmombay! These files were changed:

build-system/babel-plugins/OWNERS
build-system/eslint-rules/OWNERS

Hey @jridgewell! These files were changed:

build-system/babel-plugins/OWNERS
build-system/eslint-rules/OWNERS
src/core/OWNERS

Hey @alanorozco! These files were changed:

build-system/server/app-index/OWNERS
build-system/tasks/markdown-toc/OWNERS
build-system/tasks/storybook/OWNERS

Hey @estherkim! These files were changed:

build-system/tasks/e2e/OWNERS

Hey @danielrozenberg! These files were changed:

build-system/tasks/visual-diff/OWNERS

Hey @Jiaming-X! These files were changed:

extensions/amp-ad-network-adsense-impl/OWNERS

Hey @jeffkaufman! These files were changed:

extensions/amp-ad-network-adsense-impl/OWNERS
extensions/amp-ad-network-doubleclick-impl/OWNERS

Hey @gmajoulet! These files were changed:

extensions/amp-cache-url/OWNERS
extensions/amp-story-360/OWNERS
extensions/amp-story-dev-tools/OWNERS
extensions/amp-story-education/OWNERS
extensions/amp-story-interactive/OWNERS
extensions/amp-story-panning-media/OWNERS
extensions/amp-story-player/OWNERS
extensions/amp-story/OWNERS

Hey @mszylkowski! These files were changed:

extensions/amp-cache-url/OWNERS
extensions/amp-story-dev-tools/OWNERS
extensions/amp-story-interactive/OWNERS

Hey @processprocess! These files were changed:

extensions/amp-story-360/OWNERS
extensions/amp-story-panning-media/OWNERS

Hey @t0mg! These files were changed:

extensions/amp-story-360/OWNERS

Hey @newmuis! These files were changed:

extensions/amp-story-panning-media/OWNERS
extensions/amp-story-player/OWNERS
extensions/amp-story/OWNERS

Hey @Enriqe! These files were changed:

extensions/amp-story-player/OWNERS
extensions/amp-story/OWNERS
src/amp-story-player/OWNERS

Hey @wassgha! These files were changed:

testing/amp-performance-extension/OWNERS

Hey @ampproject/wg-caching! These files were changed:

validator/OWNERS

[danielrozenberg]

Blocking comment per @rsimha's request

[rsimha]

Update: ampproject/amp-github-apps#1256 has been merged, and the default branch of amp-github-apps has been renamed.

This PR can be merged now. @jridgewell @kristoferbaxter Could I get a top-level owners approval from one of you? And @danielrozenberg, could I get an Infra-team approval from you?

[jridgewell]

:rubber-stamp:

The branch has been renamed, and this PR is now safe to merge.