chore(dynamodb-global): use NODEJS_14_X in GlobalTableCoordinator (aws#13307)

Use `NODEJS_14_X` in `GlobalTableCoordinator` since `NODEJS_10_X` is reaching maintenance EOL.

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: robertd

packages/@aws-cdk/aws-dynamodb-global/lib/global-table-coordinator.ts

@@ -19,7 +19,7 @@ export class GlobalTableCoordinator extends cdk.Stack {
       code: lambda.Code.fromAsset(path.resolve(__dirname, '../', 'lambda-packages', 'aws-global-table-coordinator', 'lib')),
       description: 'Lambda to make DynamoDB a global table',
       handler: 'index.handler',
-      runtime: lambda.Runtime.NODEJS_10_X,
+      runtime: lambda.Runtime.NODEJS_14_X,
       timeout: cdk.Duration.minutes(5),
       uuid: 'D38B65A6-6B54-4FB6-9BAD-9CD40A6DAC12',
     });

packages/@aws-cdk/aws-dynamodb-global/test/integ.dynamodb.global.expected.json

@@ -203,7 +203,7 @@
               "Arn"
             ]
           },
-          "Runtime": "nodejs10.x",
+          "Runtime": "nodejs14.x",
           "Description": "Lambda to make DynamoDB a global table",
           "Timeout": 300
         },