bump rails 5.2

Change-Id: I2de8a8facb68696da62917ed6dafeca946218d98
Reviewed-on: https://gerrit.instructure.com/198572
Tested-by: Jenkins
Reviewed-by: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>

Gemfile.d/app.rb

@@ -18,7 +18,7 @@
 if CANVAS_RAILS5_1
   gem 'rails', '5.1.6.2'
 else
-  gem 'rails', '5.2.2.1'
+  gem 'rails', '5.2.3'
 end
     gem 'loofah', '2.2.3'
 

gems/plugins/account_reports/lib/account_reports/report_helper.rb

@@ -428,12 +428,12 @@ module AccountReports::ReportHelper
 
   class ExtendedCSV < CSV
     def <<(row)
-      if @lineno % 1_000 == 0
+      if lineno % 1_000 == 0
         Shackles.activate(:master) do
           report = self.instance_variable_get(:@account_report).reload
           updates = {}
-          updates[:current_line] = @lineno
-          updates[:progress] = (@lineno.to_f / report.total_lines * 100).to_i if report.total_lines
+          updates[:current_line] = lineno
+          updates[:progress] = (lineno.to_f / report.total_lines * 100).to_i if report.total_lines
           report.update_attributes(updates)
           if report.workflow_state == 'deleted'
             report.workflow_state = 'aborted'

spec/controllers/lti/ims/security_controller_spec.rb

@@ -39,7 +39,7 @@ module Lti::Ims
 
     it 'sets the Cache-control header' do
       get url
-      expect(response.headers['Cache-Control']).to eq 'max-age=864000'
+      expect(response.headers['Cache-Control']).to include 'max-age=864000'
     end
 
     it 'returns well-formed public key jwks' do