chore(deps): update dependency cloudevents to v8

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cloudevents	^7.0.0 -> ^8.0.0

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Release Notes

cloudevents/sdk-javascript (cloudevents)

v8.0.0

Compare Source

⚠ BREAKING CHANGES

• use string instead of enum for Version (#​561) (15f6505)
  TypeScript does not consider enum values equivalent, even if the string
  representation is the same. So, when a module imports cloudevents and
  also has a dependency on cloudevents this can cause conflicts where
  the CloudEvent.version attribute is not considered equal when, in
  fact, it is.

Miscellaneous

• add npm run build:schema to the doc generation action (#​557) (fa388f7)
• modify release-please to use Signed-Off-By on commits (#​559) (089520a)
• release 8.0.0 (#​563) (1ed43c8)

v7.0.2

Compare Source

Miscellaneous

• add the provenance flag when publishing to npm (#​556) (a0d8682)
• fix the release-please automation script. (#​554) (023171d)

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