Correct the signing.

Author: dlemstra

actions/code-signing/action.yml

@@ -43,7 +43,7 @@ runs:
       if: steps.should_sign.outputs.should_sign == 'true'
       shell: pwsh
       run: |
-        sign code trusted-signing `
+        dotnet sign code trusted-signing `
           --trusted-signing-account ImageMagick `
           --trusted-signing-certificate-profile ImageMagick `
           --trusted-signing-endpoint https://eus.codesigning.azure.net `