Change some instances of Nokogiri HTML4 parsing to HTML5 (#31812)

app/services/fetch_oembed_service.rb

@@ -25,7 +25,7 @@ class FetchOEmbedService
     return if html.nil?
 
     @format = @options[:format]
-    page    = Nokogiri::HTML(html)
+    page    = Nokogiri::HTML5(html)
 
     if @format.nil? || @format == :json
       @endpoint_url ||= page.at_xpath('//link[@type="application/json+oembed"]|//link[@type="text/json+oembed"]')&.attribute('href')&.value

app/services/fetch_resource_service.rb

@@ -73,7 +73,7 @@ class FetchResourceService < BaseService
   end
 
   def process_html(response)
-    page      = Nokogiri::HTML(response.body_with_limit)
+    page      = Nokogiri::HTML5(response.body_with_limit)
     json_link = page.xpath('//link[@rel="alternate"]').find { |link| ACTIVITY_STREAM_LINK_TYPES.include?(link['type']) }
 
     process(json_link['href'], terminal: true) unless json_link.nil?

app/services/translate_status_service.rb

@@ -100,7 +100,7 @@ class TranslateStatusService < BaseService
   end
 
   def unwrap_emoji_shortcodes(html)
-    fragment = Nokogiri::HTML.fragment(html)
+    fragment = Nokogiri::HTML5.fragment(html)
     fragment.css('span[translate="no"]').each do |element|
       element.remove_attribute('translate')
       element.replace(element.children) if element.attributes.empty?