Fixes broken specs on parsers/security

Fixtures were changed on CE, but not updated on EE.

CE MR that updated the fixtures:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31146

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/13080

ee/spec/lib/gitlab/ci/parsers/security/dependency_list_spec.rb

@@ -38,7 +38,7 @@ describe Gitlab::Ci::Parsers::Security::DependencyList do
 
         expect(vuln_nokogiri.size).to eq(4)
         expect(vuln_nokogiri[0]['name']).to eq('Vulnerabilities in libxml2')
-        expect(vuln_nokogiri[0]['severity']).to eq('Unknown')
+        expect(vuln_nokogiri[0]['severity']).to eq('High')
         expect(vuln_debug.size).to eq(1)
         expect(vuln_debug[0]['name']).to eq('Regular Expression Denial of Service')
         expect(vuln_async.size).to eq(0)

ee/spec/lib/gitlab/ci/parsers/security/formatters/dependency_list_spec.rb

@@ -45,7 +45,7 @@ describe Gitlab::Ci::Parsers::Security::Formatters::DependencyList do
         expect(vulnerabilities.size).to eq(4)
         expect(vulnerabilities[0]['name']).to eq('Vulnerabilities in libxml2')
         expect(vulnerabilities[3]['name']).to eq('Bypass of a protection mechanism in libxslt')
-        expect(vulnerabilities[0]['severity']).to eq('Unknown')
+        expect(vulnerabilities[0]['severity']).to eq('High')
       end
     end
   end