docs: update database and php requirements to LTS versions

docs/src/content/docs/ar/getting-started/install.mdx

docs/src/content/docs/br/getting-started/install.mdx

docs/src/content/docs/ca/getting-started/install.mdx

docs/src/content/docs/da/getting-started/install.mdx

docs/src/content/docs/de/getting-started/install.mdx

docs/src/content/docs/el/getting-started/install.mdx

docs/src/content/docs/en/getting-started/install.mdx

docs/src/content/docs/es/getting-started/install.mdx

docs/src/content/docs/eu/getting-started/install.mdx

docs/src/content/docs/fa/getting-started/install.mdx

docs/src/content/docs/fr-ca/getting-started/install.mdx

docs/src/content/docs/fr/getting-started/install.mdx

docs/src/content/docs/fr2/getting-started/install.mdx

docs/src/content/docs/gd/getting-started/install.mdx

docs/src/content/docs/gl/getting-started/install.mdx

docs/src/content/docs/id/getting-started/install.mdx

docs/src/content/docs/it/getting-started/install.mdx

docs/src/content/docs/ja/getting-started/install.mdx

docs/src/content/docs/kk/getting-started/install.mdx

docs/src/content/docs/ko/getting-started/install.mdx