Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `app/models/custom_emoji.rb`:
  Not a real conflict, just upstream changing a line too close to
  a glitch-soc-specific validation.
  Applied upstream changes.
- `app/models/public_feed.rb`:
  Not a real conflict, just upstream changing a line too close to
  a glitch-soc-specific parameter documentation.
  Applied upstream changes.

app/lib/hashtag_normalizer.rb

@@ -8,7 +8,7 @@ class HashtagNormalizer
   private
 
   def remove_invalid_characters(str)
-    str.gsub(/[^[:alnum:]#{Tag::HASHTAG_SEPARATORS}]/, '')
+    str.gsub(Tag::HASHTAG_INVALID_CHARS_RE, '')
   end
 
   def ascii_folding(str)

app/lib/request.rb

@@ -199,7 +199,8 @@ class Request
         rescue IPAddr::InvalidAddressError
           Resolv::DNS.open do |dns|
             dns.timeouts = 5
-            addresses = dns.getaddresses(host).take(2)
+            addresses = dns.getaddresses(host)
+            addresses = addresses.filter { |addr| addr.is_a?(Resolv::IPv6) }.take(2) + addresses.filter { |addr| !addr.is_a?(Resolv::IPv6) }.take(2)
           end
         end