fix: bump version of ember-classy-page-object

To get rid of:

```
WARNING in ../rewritten-packages/ember-classy-page-object.4dd72acf/node_modules/ember-classy-page-object/extend.js 1:0-84
export 'getContext' (reexported as 'getContext') was not found in 'ember-cli-page-object/extend' (possible exports: buildSelector, findElement, findElementWithAssert, findMany, findOne, fullScope)
 @ ../../.pnpm/@embroider+babel-loader-9@3.1.1_@embroider+core@3.5.6_supports-color@8.1.1_webpack@5.97.1/node_modules/@embroider/babel-loader-9/index.js?{"variant":{"name":"dev","runtime":"browser","optimizeForProduction":false},"appBabelConfigPath":"/Users/michal/ember/ember-cli-addon-docs/node_modules/.embroider/rewritten-app/_babel_config_.js","cacheDirectory":"$TMPDIR/embroider/webpack-babel-loader"}!../../.pnpm/@embroider+webpack@3.2.3_@embroider+core@3.5.6_webpack@5.97.1/node_modules/@embroider/webpack/src/virtual-loader.js?f=%2FUsers%2Fmichal%2Fember%2Fember-cli-addon-docs%2Fnode_modules%2F.embroider%2Frewritten-app%2F-embroider-implicit-test-modules.js&a=%2FUsers%2Fmichal%2Fember%2Fember-cli-addon-docs%2Ftests%2Fdummy! 189:13-55
 @ ./assets/test.js 6:4-52
```

Author: MichalBryxi

package.json

@@ -119,7 +119,7 @@
     "chai": "^4.5.0",
     "common-tags": "^1.8.2",
     "concurrently": "^9.1.0",
-    "ember-classy-page-object": "0.8.0-beta.2",
+    "ember-classy-page-object": "0.8.0",
     "ember-cli": "~5.11.0",
     "ember-cli-addon-docs-yuidoc": "^1.1.0",
     "ember-cli-blueprint-test-helpers": "^0.19.2",