Bump Amazon.Lambda.Core from 2.7.1 to 2.8.0 (#242)

---
updated-dependencies:
- dependency-name: Amazon.Lambda.Core
  dependency-version: 2.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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src/SimpleAPI/SimpleAPI.csproj

@@ -14,6 +14,7 @@
   <ItemGroup>
     <PackageReference Include="Amazon.Lambda.APIGatewayEvents" Version="2.7.2" />
     <PackageReference Include="Amazon.Lambda.AspNetCoreServer" Version="9.2.0" />
+  <PackageReference Include="Amazon.Lambda.Core" Version="2.8.0" />
     <PackageReference Include="AWSSDK.DynamoDBv2" Version="4.0.10.1" />
   </ItemGroup>
 </Project>

test/SimpleAPI.Tests/SimpleAPI.Tests.csproj

@@ -16,7 +16,7 @@
     </Content>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Amazon.Lambda.Core" Version="2.7.1" />
+    <PackageReference Include="Amazon.Lambda.Core" Version="2.8.0" />
     <PackageReference Include="Amazon.Lambda.TestUtilities" Version="3.0.1" />
     <PackageReference Include="Amazon.Lambda.APIGatewayEvents" Version="2.7.2" />
     <PackageReference Include="AWSSDK.Extensions.NETCore.Setup" Version="4.0.3.14" />