fix(v2): use synchronous write for generate blog feeds #2540
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Motivation
Fix #2539 (see similar issue #2516)
Have you read the Contributing Guidelines on pull requests?
Yes
Test Plan
Build website and make sure that the
build/blog/atom.xml
andbuild/blog/rss.xml
files are not empty.Related PRs
(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)