docs: update Lambda runtime examples from nodejs20.x to nodejs22.x

Author: K-Sato1995

site/content/docs/developing/addons/package.en.md

@@ -20,7 +20,7 @@ For example, to deploy a javascript Lambda function alongside a copilot service,
               Timeout: 900
               MemorySize: 512
               Role: !GetAtt "ExampleFunctionRole.Arn"
-              Runtime: nodejs20.x
+              Runtime: nodejs22.x
         ```
 
     === "lambdas/example/index.js"
@@ -82,7 +82,7 @@ This architecture could be useful if you have a service that needs to minimize l
         Timeout: 60
         MemorySize: 512
         Role: !GetAtt "recordProcessorRole.Arn"
-        Runtime: nodejs20.x
+        Runtime: nodejs22.x
 
     recordProcessorRole:
       Type: AWS::IAM::Role

site/content/docs/developing/addons/package.ja.md

@@ -20,7 +20,7 @@ Copilot は、Addon テンプレートから参照されるローカルファイ
               Timeout: 900
               MemorySize: 512
               Role: !GetAtt "ExampleFunctionRole.Arn"
-              Runtime: nodejs20.x
+              Runtime: nodejs22.x
         ```
 
     === "lambdas/example/index.js"
@@ -84,7 +84,7 @@ zip が必要な一部のリソース (`AWS::Serverless::Function` など) で
         Timeout: 60
         MemorySize: 512
         Role: !GetAtt "recordProcessorRole.Arn"
-        Runtime: nodejs20.x
+        Runtime: nodejs22.x
 
     recordProcessorRole:
       Type: AWS::IAM::Role