Backport @actions/core 1.10.0 to support the deprecation of set-output and save-state stdout versions #347

As part of the deprecation work for the stdout version of set-output and save-state workflow commands we've observed that versions v3, v4 and v5 are generating warnings for our users.
To remove these (and avoid breaking our users workflows come 31st May) we need to update @actions/core to >=1.10.0 for these versions.