Fix frozen string errors

lib/gitlab/profiler.rb

@@ -97,7 +97,7 @@ module Gitlab
           attr_reader :load_times_by_model, :private_token
           def debug(message, *)
-            message.gsub!(private_token, FILTERED_STRING) if private_token
+            message = message.gsub(private_token, FILTERED_STRING) if private_token
             _, type, time = *message.match(/(\w+) Load \(([0-9.]+)ms\)/)

spec/lib/gitlab/search/found_blob_spec.rb

@@ -109,7 +109,7 @@ describe Gitlab::Search::FoundBlob do
       end
       context 'with ISO-8859-1' do
-        let(:search_result) { "master:encoding/iso8859.txt\x001\x00\xC4\xFC\nmaster:encoding/iso8859.txt\x002\x00\nmaster:encoding/iso8859.txt\x003\x00foo\n".force_encoding(Encoding::ASCII_8BIT) }
+        let(:search_result) { (+"master:encoding/iso8859.txt\x001\x00\xC4\xFC\nmaster:encoding/iso8859.txt\x002\x00\nmaster:encoding/iso8859.txt\x003\x00foo\n").force_encoding(Encoding::ASCII_8BIT) }
         it 'returns results as UTF-8' do
           expect(subject.filename).to eq('encoding/iso8859.txt')