chore(gemspec): update fluentd >= 1.14.x

 - update fluentd to 1.14.x gem
 - update json gem to 2.5.1
 - fix deprecation warnings during rake tests: `common.rb:114: warning: calling URI.open via Kernel#open is deprecated, call URI.open directly or use URI#open`

Fluentd changelog for [v1.14.x](https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1140)

Signed-off-by: Anton Ouzounov <[email protected]>

fluent-plugin-google-cloud.gemspec

@@ -10,7 +10,7 @@ eos
   gem.homepage      =
     'https://github.com/GoogleCloudPlatform/fluent-plugin-google-cloud'
   gem.license       = 'Apache-2.0'
-  gem.version       = '0.12.3'
+  gem.version       = '0.13.0'
   gem.authors       = ['Stackdriver Agents Team']
   gem.email         = ['[email protected]']
   gem.required_ruby_version = Gem::Requirement.new('>= 2.2')
@@ -22,14 +22,14 @@ eos
   # Note: In order to update the Fluentd version, please update both here and
   # also the fluentd version in
   # https://github.com/GoogleCloudPlatform/google-fluentd/blob/master/config/software/fluentd.rb.
-  gem.add_runtime_dependency 'fluentd', '1.13.3'
+  gem.add_runtime_dependency 'fluentd', '~> 1.14.0'
   gem.add_runtime_dependency 'googleapis-common-protos', '1.3.10'
   gem.add_runtime_dependency 'googleauth', '0.9.0'
   gem.add_runtime_dependency 'google-api-client', '0.30.8'
-  gem.add_runtime_dependency 'google-cloud-logging', '1.6.6'
+  gem.add_runtime_dependency 'google-cloud-logging', '1.7.0'
   gem.add_runtime_dependency 'google-protobuf', '3.17.3'
   gem.add_runtime_dependency 'grpc', '1.31.1'
-  gem.add_runtime_dependency 'json', '2.4.1'
+  gem.add_runtime_dependency 'json', '2.5.1'
   gem.add_runtime_dependency 'opencensus', '0.5.0'
   gem.add_runtime_dependency 'opencensus-stackdriver', '0.4.1'
 

lib/fluent/plugin/common.rb

@@ -111,7 +111,7 @@ def detect_platform(use_metadata_service)
       end
 
       begin
-        open('http://' + METADATA_SERVICE_ADDR, proxy: false) do |f|
+        URI.open('http://' + METADATA_SERVICE_ADDR, proxy: false) do |f|
           if f.meta['metadata-flavor'] == 'Google'
             @log.info 'Detected GCE platform'
             return Platform::GCE
@@ -133,9 +133,8 @@ def fetch_gce_metadata(platform, metadata_path)
       raise "Called fetch_gce_metadata with platform=#{platform}" unless
         platform == Platform::GCE
       # See https://cloud.google.com/compute/docs/metadata
-      open('http://' + METADATA_SERVICE_ADDR + '/computeMetadata/v1/' +
-           metadata_path, 'Metadata-Flavor' => 'Google', :proxy => false,
-           &:read)
+      URI.open('http://' + METADATA_SERVICE_ADDR + '/computeMetadata/v1/' +
+         metadata_path, 'Metadata-Flavor' => 'Google', :proxy => false, &:read)
     end
 
     # EC2 Metadata server returns everything in one call. Store it after the
@@ -145,7 +144,7 @@ def ec2_metadata(platform)
         platform == Platform::EC2
       unless @ec2_metadata
         # See http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html
-        open('http://' + METADATA_SERVICE_ADDR +
+        URI.open('http://' + METADATA_SERVICE_ADDR +
              '/latest/dynamic/instance-identity/document', proxy: false) do |f|
           contents = f.read
           @ec2_metadata = JSON.parse(contents)