Update to rc tag for capability module

[chatton]

Description

The capability/release/v1.0.x release branch was created, and tagged with modules/capability/v1.0.0-rc1

The go.mod and go.sum of ibc-go/e2e are being updated to point at this rc.

Note: I needed to make these changes which can be reverted once we update to an sdk version that does not contain the capability module.

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• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
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• Wrote unit and integration tests.
• Updated relevant documentation (docs/) or specification (x/<module>/spec/).
• Added relevant godoc comments.
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[crodriguezvega]

Thanks, @chatton!

[colin-axner]

Thanks @chatton! :)