v1.9.1 release candidate (rstudio#4112)

* v1.9.1 release candidate

* `yarn build` (GitHub Actions)

* Sync package version (GitHub Actions)

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Co-authored-by: cpsievert <[email protected]>

v1.9.0 release candidate (rstudio#4105)

* Start v1.9.0 release candidate

* Check-in revdep results

* `yarn build` (GitHub Actions)

* Sync package version (GitHub Actions)

* `yarn build` (GitHub Actions)

* ran revdepcheck on cloud. 2 errors reported. Both seem like false positives

* Fix R CMD check note about Rd links targets missing package anchors

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Co-authored-by: cpsievert <[email protected]>
Co-authored-by: Barret Schloerke <[email protected]>
Co-authored-by: schloerke <[email protected]>

Start v1.8.1.1 release candidate (rstudio#4020)

* Start v1.8.1.1 release candidate

* `yarn build` (GitHub Actions)

* Sync package version (GitHub Actions)

* Remove alpha from npm version

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Co-authored-by: cpsievert <[email protected]>

v1.8.1 release candidate (rstudio#4008)

* Start v1.8.1 release candidate

* Update urls and yarn build

* Sync package version (GitHub Actions)

* Check-in revdep results

* Groom news

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Co-authored-by: cpsievert <[email protected]>

Latest shiny version used in py-shiny (dev)

v1.8.0 release candidate (rstudio#3928)

Remove alpha from the npm version

1.7.5 release candidate (rstudio#3867)

Co-authored-by: cpsievert <[email protected]>

shiny v1.7.4.1

Remove use of as.numeric_version()
Closes rstudio#3849

Change header syntax in NEWS.md (to match what usethis does)