update/tighten dependencies

debian/control

@@ -236,11 +236,18 @@ Depends: ${shlibs:Depends}, ${misc:Depends}, ruby | ruby-interpreter,
  ruby-select2-rails (>= 3.5.9~),
  ruby-virtus (>= 1.0.5-3~),
  ruby-net-ssh (>= 1:4.0~),
+# Required for ED25519 SSH host key support
+ ruby-rbnacl-libsodium,
+ ruby-rbnacl,
+ ruby-bcrypt-pbkdf,
  ruby-base32 (>= 0.3.0~),
 # Metrics
  ruby-allocations (>= 1.0~),
  ruby-method-source (>= 0.8.2-2~),
  ruby-influxdb (>= 0.2~),
+# Prometheus
+ ruby-prometheus-client-mmap,
+ ruby-raindrops (>= 0.18~),
  ruby-connection-pool (>= 2.0~),
  ruby-sentry-raven (>= 2.5.3~),
  ruby-premailer-rails (>= 1.9.7~),
@@ -272,9 +279,9 @@ Depends: ${shlibs:Depends}, ${misc:Depends}, ruby | ruby-interpreter,
 # OAuth
  ruby-oauth2 (>= 1.3~),
 # Soft deletion
- ruby-paranoia (>= 2.2~),
+ ruby-paranoia (>= 2.3.1~),
 # Health check
- ruby-health-check (>= 2.1~),
+ ruby-health-check (>= 2.6~),
 # System information
  ruby-vmstat (>= 2.3~),
  ruby-sys-filesystem,