Lock package manager version (#175495)

I believe the intention was to restrict the `yarn` version to `1.22.19`,
but the current `package.json` setup does not enforce it. This config
change should do it.

None.

None.

- [ ] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

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

package.json

@@ -67,7 +67,7 @@
   },
   "engines": {
     "node": "20.10.0",
-    "yarn": "^1.21.1"
+    "yarn": "^1.22.21"
   },
   "resolutions": {
     "**/@types/node": "20.10.6",
@@ -834,5 +834,6 @@
     "xmlbuilder": "13.0.2",
     "yargs": "^15.4.1",
     "zlib": "^1.0.5"
-  }
+  },
+  "packageManager": "[email protected]"
 }