ci: upgrades esrp code sign task version because of underlying node version deprecation

Signed-off-by: Vincent Biret <vibiret@microsoft.com>

Author: baywet

.azure-pipelines/ci-build.yml

@@ -112,7 +112,7 @@ extends:
             projects: '$(Build.SourcesDirectory)\Microsoft.OpenApi.slnx'
             arguments: '--configuration $(BuildConfiguration) --no-build'
 
-        - task: EsrpCodeSigning@5
+        - task: EsrpCodeSigning@6
           displayName: 'ESRP CodeSigning binaries'
           inputs:
             ConnectedServiceName: 'Federated DevX ESRP Managed Identity Connection'
@@ -178,7 +178,7 @@ extends:
         - pwsh: dotnet pack $(Build.SourcesDirectory)/src/Microsoft.OpenApi.Hidi/Microsoft.OpenApi.Hidi.csproj -o $(Build.ArtifactStagingDirectory) --configuration $(BuildConfiguration) --no-build --no-restore --include-symbols --include-source /p:SymbolPackageFormat=snupkg
           displayName: 'pack Hidi'
 
-        - task: EsrpCodeSigning@5
+        - task: EsrpCodeSigning@6
           displayName: 'ESRP CodeSigning Nuget Packages'
           inputs:
             ConnectedServiceName: 'Federated DevX ESRP Managed Identity Connection'