Use to_h instead of to_hash for vulnerability_flag

ee/app/models/vulnerabilities/flag.rb

@@ -15,7 +15,7 @@ module Vulnerabilities
     }
 
     def initialize(attributes)
-      attributes = attributes.to_hash if attributes.instance_of?(Gitlab::Ci::Reports::Security::Flag)
+      attributes = attributes.to_h if attributes.respond_to?(:to_h)
       super(attributes)
     end
   end

ee/app/services/security/store_report_service.rb

@@ -269,7 +269,7 @@ module Security
 
       vulnerability_finding_to_finding_map.each_slice(BATCH_SIZE) do |vf_to_findings|
         records = vf_to_findings.flat_map do |vulnerability_finding, finding|
-          finding.flags.map { |flag| timestamps.merge(**flag.to_hash, vulnerability_occurrence_id: vulnerability_finding.id) }
+          finding.flags.map { |flag| timestamps.merge(**flag.to_h, vulnerability_occurrence_id: vulnerability_finding.id) }
         end
 
         records.uniq!

lib/gitlab/ci/reports/security/flag.rb

@@ -20,7 +20,7 @@ module Gitlab
             @description = description
           end
 
-          def to_hash
+          def to_h
             {
               flag_type: flag_type,
               origin: origin,

spec/lib/gitlab/ci/reports/security/flag_spec.rb

@@ -18,9 +18,9 @@ RSpec.describe Gitlab::Ci::Reports::Security::Flag do
       end
     end
 
-    describe '#to_hash' do
+    describe '#to_h' do
       it 'returns expected hash' do
-        expect(security_flag.to_hash).to eq(
+        expect(security_flag.to_h).to eq(
           {
             flag_type: :false_positive,
             origin: 'post analyzer X',