DRAFT: fix deprecation warnings for trixie

[brainexe]

/usr/lib/python3/dist-packages/serveradmin/serverdb/migrations/0007_hostname_regex_hyphens.py:29: SyntaxWarning: invalid escape sequence '\A'
  "CHECK (hostname::text ~ '\A(\*\.)?([a-z0-9]+(\.|-+))*[a-z0-9]+\Z'::text);"
/usr/lib/python3/dist-packages/serveradmin/serverdb/migrations/0007_hostname_regex_hyphens.py:35: SyntaxWarning: invalid escape sequence '\A'
  "CHECK (hostname::text ~ '\A(\*\.)?([a-z0-9]+[\.\-])*[a-z0-9]+\Z'::text);"
/usr/lib/python3/dist-packages/serveradmin/serverdb/migrations/0018_alter_server_hostname.py:24: SyntaxWarning: invalid escape sequence '\A'
  "CHECK (hostname::text ~ '\A(\*\.)?([a-z0-9_]+(\.|-+))*[a-z0-9]+\Z'::text);"
/usr/lib/python3/dist-packages/serveradmin/serverdb/migrations/0018_alter_server_hostname.py:30: SyntaxWarning: invalid escape sequence '\A'
  "CHECK (hostname::text ~ '\A(\*\.)?([a-z0-9]+(\.|-+))*[a-z0-9]+\Z'::text);"
/usr/lib/python3/dist-packages/serveradmin/serverdb/sql_generator.py:226: SyntaxWarning: invalid escape sequence '\.'
  "server.hostname ~ ('\\A[^\.]+\.' || regexp_replace("
/usr/lib/python3/dist-packages/serveradmin/serverdb/sql_generator.py:227: SyntaxWarning: invalid escape sequence '\*'
  "sub.hostname, '(\*|\-|\.)', '\\\1', 'g') || '\\Z')",