update react version needed by next@canary

Author: pieh

tests/utils/next-version-helpers.mjs

@@ -9,7 +9,7 @@ const FUTURE_NEXT_PATCH_VERSION = '14.999.0'
 
 const NEXT_VERSION_REQUIRES_REACT_19 = '14.3.0-canary.45'
 // TODO: Update this when React 19 is released
-const REACT_19_VERSION = '19.0.0-rc.0'
+const REACT_19_VERSION = '19.0.0-rc-1eaccd82-20240816'
 const REACT_18_VERSION = '18.2.0'
 
 /**