fix: sync docs-site/yarn.lock with narrowed react/react-dom peerDependencies

The docs-site lockfile (separate from the root yarn.lock) still cached
the old '^16.9.0 || ^17 || ^18 || ^19 || ^19.0.0-rc' peerDependencies
range for the portal:../ react-datepicker package after 7812b53
narrowed it in root package.json. CI's 'yarn --cwd docs-site install'
runs in hardened mode on public PRs and refuses to auto-fix a stale
lockfile, causing the Install docs dependencies job to fail.

Author: SaiBalaji202

docs-site/yarn.lock

@@ -4697,8 +4697,8 @@ __metadata:
     date-fns: "npm:^4.1.0"
   peerDependencies:
     date-fns-tz: ^3.0.0
-    react: ^16.9.0 || ^17 || ^18 || ^19 || ^19.0.0-rc
-    react-dom: ^16.9.0 || ^17 || ^18 || ^19 || ^19.0.0-rc
+    react: ^17 || ^18 || ^19 || ^19.0.0-rc
+    react-dom: ^17 || ^18 || ^19 || ^19.0.0-rc
   peerDependenciesMeta:
     date-fns-tz:
       optional: true