v2022.12.24

Upstream changes

• Merge pull request 'Only count updating (i.e. enabled) feeds when determining active feeds with errors.' (#96) from wn/tt-rss:feature/only-warn-for-updating-feeds into master
• Only count updating (i.e. enabled) feeds when determining active feeds with errors.
• Merge pull request 'Only touch on send for expirable cache files.' (#95) from wn/tt-rss:bugfix/local-cache-feed-icons-ts into master
• Only touch on send for expirable cache files.
• make phpstan happy
• • bring back cache-busting for feed icons based on timestamp * DiskCache: use singleton pattern to create less cache object instances * DiskCache: implement ETag
• limit tree expando white color to prefs