ci(docs): Trigger shiny-dev-center docs on Shiny GH tag #4296
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Fixes #4295
Related: https://github.com/rstudio/shiny-dev-center/commit/de9466def7820c6be5e3bcac12656bf5fe2c7faf
Related: https://github.com/rstudio/shiny-dev-center/pull/390