[ci] increase signing timeout to 120 minutes (#1157)

dotnet/android-libraries/main has increased the size of packages due
to the `net10.0-android` target framework.

Increase the timeout of the signing step to account for this.

Author: jonathanpeppers

build/ci/stage-sign-artifacts.yml

@@ -10,6 +10,7 @@ stages:
 
   - template: sign-artifacts/jobs/v2.yml@yaml-templates
     parameters:
+      timeoutInMinutes: 120
       artifactName: output-windows
       usePipelineArtifactTasks: true
       use1ESTemplate: true