Update xpkg.upbound.io/upbound/provider-opentofu Docker tag to v1

This MR contains the following updates:

Package	Type	Update	Change
xpkg.upbound.io/upbound/provider-opentofu		major	v0.2.7 -> v1.0.0
xpkg.upbound.io/upbound/provider-opentofu	ironbank-docker	major	v0.2.7 -> v1.0.0
xpkg.upbound.io/upbound/provider-opentofu	stage	major	v0.2.7 -> v1.0.0

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