Update token in git checkout

[maleadt]

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We currently check-out the workdir with our token, https://github.com/JuliaCI/Nanosoldier.jl/blob/a1cfb9d997a2545d2b397ec4ffefae9555cb8453/src/utils.jl#L19, but fail to update this configuration when the token changes, necessitating manual actions.