Update gems and fix lint to clear CI failures

Bumps dependencies (jwt 3.2.0, puma 8.0.2, net-imap 0.6.4.1 and others
via bundle update) to resolve bundler-audit advisories, and applies
standardrb autofixes so the lint job passes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/lib/private_address_check.rb

@@ -35,7 +35,7 @@ module PrivateAddressCheck
     return [ip] if ip
 
     Resolv.getaddresses(host.to_s).filter_map { |a| parse_ip(a) }
-  rescue StandardError
+  rescue
     # Resolution failure: surface no addresses. Callers treat "can't resolve" as
     # not-provably-internal; the dial itself will then fail safely.
     []