use fixed version of credential

Author: David Maloney

Gemfile

@@ -7,7 +7,7 @@ group :db do
   # Needed for Msf::DbManager
   gem 'activerecord', '>= 3.0.0', '< 4.0.0'
   # Metasploit::Credential database models
-  gem 'metasploit-credential', git: 'github-metasploit-credential:rapid7/metasploit-credential.git', tag: 'v0.4.6-electro-release'
+  gem 'metasploit-credential', git: 'github-metasploit-credential:rapid7/metasploit-credential.git', tag: 'v0.4.8-electro-release'
   # Database models shared between framework and Pro.
   gem 'metasploit_data_models', '~> 0.17.2.pre.metasploit.pre.data.pre.models.pre.search'
   # Needed for module caching in Mdm::ModuleDetails

Gemfile.lock

@@ -1,9 +1,9 @@
 GIT
   remote: github-metasploit-credential:rapid7/metasploit-credential.git
-  revision: 7ef85cf01921e176524592957b650c6df9f0be84
-  tag: v0.4.6-electro-release
+  revision: b7234221ce41e311947e3e32c03aa7b6474f4f4f
+  tag: v0.4.8-electro-release
   specs:
-    metasploit-credential (0.4.6.pre.electro.pre.release)
+    metasploit-credential (0.4.8.pre.electro.pre.release)
       metasploit-concern (~> 0.1.0)
       metasploit-model (>= 0.24.1.pre.semantic.pre.versioning.pre.2.pre.0, < 0.25)
       metasploit_data_models (>= 0.17.2.pre.metasploit.pre.data.pre.models.pre.search, < 0.18)