Updates scratch-blocks manually because https://github.com/LLK/scratch-gui/pull/5501 had package-lock conflicts with the l10n PR

This reverts commit a27ddaf4.

Commits to gh-pages "fail" on CircleCI since there's no config on the branch. Skip these commits using a tag I can't write here because I do want CI to run on this commit :)

This is to remove the latest svg-renderer change, "add rounded edges to gradient strokes", because we would like to come up with a more comprehensive testing plan before adding it.

Closes #5335

Closes #5405

Closes #5401

Closes #5396

Closes #5354