Upgrade to Grafana v8.4

[ru] DOCS_SHARED: "docs/grafana/latest/upgrade-guide/upgrade-v8.4/index.ru.md" ("/hugo/content/docs/grafana/latest/upgrade-guide/upgrade-v8.4/index.ru.md:19:1") shared directory "docs/grafana/latest/shared" not found

[ru] DOCS_SHARED: "docs/grafana/latest/upgrade-guide/upgrade-v8.4/index.ru.md" ("/hugo/content/docs/grafana/latest/upgrade-guide/upgrade-v8.4/index.ru.md:21:1") shared directory "docs/grafana/latest/shared" not found

[ru] DOCS_SHARED: "docs/grafana/latest/upgrade-guide/upgrade-v8.4/index.ru.md" ("/hugo/content/docs/grafana/latest/upgrade-guide/upgrade-v8.4/index.ru.md:23:1") shared directory "docs/grafana/latest/shared" not found