Update `auto_linker` dependency

Notable changes in auto_linker:

• Improved detection of URLs (auto_linker#2)
• Improved Asian scripts support (auto_linker#3)
• Extra tests for AutoLinker.Builder (thanks to @lanodan)

Diff with the version which Pleroma currently depends on: https://git.pleroma.social/pleroma/auto_linker/compare/94193ca5...master