replace deprecated GitExecuteError by Error

lib/knife/changelog/policyfile.rb

@@ -147,7 +147,7 @@ def git_ref(myref, repo, cookbook_name = nil)
     existing_ref = possible_refs.find do |ref|
       begin
         repo.checkout(ref)
-      rescue ::Git::GitExecuteError
+      rescue ::Git::Error
         false
       end
     end

spec/unit/policyfile_spec.rb

@@ -200,7 +200,7 @@
 
     context 'when tag valid' do
       it 'returns correct git tag' do
-        allow(repo).to receive(:checkout).with('v1.0.0').and_raise(::Git::GitExecuteError)
+        allow(repo).to receive(:checkout).with('v1.0.0').and_raise(::Git::Error)
         allow(repo).to receive(:checkout).with('1.0.0').and_return(true)
 
         expect(changelog.git_ref('1.0.0', repo)).to eq('1.0.0')
@@ -209,13 +209,13 @@
 
     context 'when tag invalid and able to correct' do
       it 'returns correct git tag' do
-        allow(repo).to receive(:checkout).with('1.0.0').and_raise(::Git::GitExecuteError)
+        allow(repo).to receive(:checkout).with('1.0.0').and_raise(::Git::Error)
 
         tags = %w[v1.0.0 1.0 v1.0 cookbook_name-1.0.0 cookbook_name-1.0 cookbook_name-v1.0.0 cookbook_name-v1.0]
         tags.each do |valid_result|
           allow(repo).to receive(:checkout).with(valid_result).and_return(true)
           tags.reject { |v| v == valid_result }.each do |invalid_result|
-            allow(repo).to receive(:checkout).with(invalid_result).and_raise(::Git::GitExecuteError)
+            allow(repo).to receive(:checkout).with(invalid_result).and_raise(::Git::Error)
           end
           expect(changelog.git_ref('1.0.0', repo, 'cookbook_name')).to eq valid_result
         end
@@ -225,7 +225,7 @@
     context 'when tags invalid and unable to correct' do
       it 'raises exception' do
         allow(repo).to receive(:remote).and_return(double('remote', url: 'url.com'))
-        allow(repo).to receive(:checkout).with(any_args).and_raise(::Git::GitExecuteError)
+        allow(repo).to receive(:checkout).with(any_args).and_raise(::Git::Error)
 
         expect { changelog.git_ref('1.0.0', repo) }
           .to raise_error(RuntimeError, /Impossible to find existing/)