Upgrade deprecated Lambda runtimes in examples

- aspnet-mvc-zip: dotnet6 -> dotnet8 (runtime, csproj, README)
- aspnet-webapi-zip: dotnet6 -> dotnet8 (runtime, csproj, README)
- expressjs-zip: nodejs18.x -> nodejs22.x

Author: bnusunny

examples/aspnet-mvc-zip/README.md

@@ -2,7 +2,7 @@
 
 This example shows how to deploy an ASP.NET application using the Lambda Web Adapter packaged as a ZIP file.
 
-The `dotnet6` runtime is used.
+The `dotnet8` runtime is used.
 
 ```yaml
 Resources:
@@ -28,7 +28,7 @@ Resources:
 
 ## Build & Deploy
 
-Make sure .NET 6 is already installed. Run the following commands on a x86_64 machine. 
+Make sure .NET 8 is already installed. Run the following commands on a x86_64 machine. 
 
 ```shell
 sam build --use-container

examples/aspnet-mvc-zip/src/AspNetLambdaZipWebAdapter.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>

examples/aspnet-mvc-zip/template.yaml

@@ -4,7 +4,7 @@ Transform: AWS::Serverless-2016-10-31
 Globals:
   Function:
     MemorySize: 1024
-    Runtime: dotnet6
+    Runtime: dotnet8
     Architectures:
       - x86_64
     Timeout: 29

examples/aspnet-webapi-zip/README.md

@@ -2,7 +2,7 @@
 
 This example shows how to deploy an ASP.NET application using the Lambda Web Adapter packaged as a ZIP file.
 
-The `dotnet6` runtime is used.
+The `dotnet8` runtime is used.
 
 ```yaml
 Resources:
@@ -36,7 +36,7 @@ A shell script is used as the handler to startup the ASP.NET web application.
 
 ## Build & Deploy
 
-Make sure .NET 6 is already installed. Run the following commands on a x86_64 machine. 
+Make sure .NET 8 is already installed. Run the following commands on a x86_64 machine. 
 
 ```shell
 sam build --use-container

examples/aspnet-webapi-zip/src/AspNetWebApi.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <InvariantGlobalization>true</InvariantGlobalization>

examples/aspnet-webapi-zip/template.yaml

@@ -4,7 +4,7 @@ Transform: AWS::Serverless-2016-10-31
 Globals:
   Function:
     MemorySize: 1024
-    Runtime: dotnet6
+    Runtime: dotnet8
     Architectures:
       - x86_64
     Timeout: 29

examples/expressjs-zip/template.yaml

@@ -16,7 +16,7 @@ Resources:
     Properties:
       CodeUri: hello-world/
       Handler: run.sh
-      Runtime: nodejs18.x
+      Runtime: nodejs22.x
       MemorySize: 1024
       Architectures:
         - x86_64