Fix action config uses syntax

[ptim]

Closes #3

According to: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsuses

[Erisa]

This should be @v1 instead.

See: #3 (comment)

[ptim]

Tx Erisa, as pointed out by in comments on #3, using @v1 requires an additional tag to be added to each release... in advance of doing so, @v1.0.0 is the only config that actually works 👍

CC @GregBrimble

[GregBrimble]

We've just tagged this Action as 1.0.0 and 1 and will drop the v prefix going forward. Thanks for your help in identifying this problem—hopefully this works for everyone now.

#3 (comment)