fix(deps): update dependency cloudevents to v6

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cloudevents	^5.3.2 -> ^6.0.0

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Release Notes

cloudevents/sdk-javascript

### [`v6.0.1`](https://togithub.com/cloudevents/sdk-javascript/blob/HEAD/CHANGELOG.md#​601-httpswwwgithubcomcloudeventssdk-javascriptcomparev600v601-2022-03-21) [Compare Source](https://togithub.com/cloudevents/sdk-javascript/compare/v6.0.0...v6.0.1) ### [`v6.0.0`](https://togithub.com/cloudevents/sdk-javascript/blob/HEAD/CHANGELOG.md#​600-httpswwwgithubcomcloudeventssdk-javascriptcomparev532v600-2022-03-21) [Compare Source](https://togithub.com/cloudevents/sdk-javascript/compare/v5.3.2...v6.0.0) ##### ⚠ BREAKING CHANGES - add http transport and remove axios ([#​481](https://togithub.com/cloudevents/sdk-javascript/issues/481)) ##### Features - add http transport and remove axios ([#​481](https://www.togithub.com/cloudevents/sdk-javascript/issues/481)) ([0362a4f](https://www.github.com/cloudevents/sdk-javascript/commit/0362a4f11c7bdc74a3a9a05b5bb4a94516b15a44)) - precompile cloudevent schema ([#​471](https://www.togithub.com/cloudevents/sdk-javascript/issues/471)) ([b13bde9](https://www.github.com/cloudevents/sdk-javascript/commit/b13bde9b4967f5c8b02b788a40a89dd4cec5b78a)) ##### Miscellaneous - add an npm test:once script ([#​480](https://www.togithub.com/cloudevents/sdk-javascript/issues/480)) ([b4d7aa9](https://www.github.com/cloudevents/sdk-javascript/commit/b4d7aa9adbb92bb5d037c464dd3d4bcd1ba88fe6)) - update package.json format and deps ([#​479](https://www.togithub.com/cloudevents/sdk-javascript/issues/479)) ([6204805](https://www.github.com/cloudevents/sdk-javascript/commit/6204805bfcebf68fd1b94777ecb3df6d7473e10e)) - update the release documentation ([#​476](https://www.togithub.com/cloudevents/sdk-javascript/issues/476)) ([c420da4](https://www.github.com/cloudevents/sdk-javascript/commit/c420da479343bc71a5ba4d5ed41841280f4c989a)) ##### Documentation - update readme to include http builtin transport ([#​483](https://www.togithub.com/cloudevents/sdk-javascript/issues/483)) ([4ab6356](https://www.github.com/cloudevents/sdk-javascript/commit/4ab6356bd70434e55938ff89e940952f8b0105a3)) ##### [5.3.2](https://www.github.com/cloudevents/sdk-javascript/compare/v5.3.1...v5.3.2) (2022-02-11) ##### Bug Fixes - use `isolatedModules: true` in tsconfig.json ([#​469](https://www.togithub.com/cloudevents/sdk-javascript/issues/469)) ([b5c0b56](https://www.github.com/cloudevents/sdk-javascript/commit/b5c0b56f52dd6119949df1a583b76a48c6e3cec7)) ##### Miscellaneous - bump typedoc to remove vuln ([#​472](https://www.togithub.com/cloudevents/sdk-javascript/issues/472)) ([c3d9f39](https://www.github.com/cloudevents/sdk-javascript/commit/c3d9f39a53afaf411fa91aeb2323fef2eddb4d32)) ##### [5.3.1](https://www.github.com/cloudevents/sdk-javascript/compare/v5.3.0...v5.3.1) (2022-02-02) ##### Bug Fixes - improve binary data detection in HTTP transport ([#​468](https://www.togithub.com/cloudevents/sdk-javascript/issues/468)) ([cd4dea9](https://www.github.com/cloudevents/sdk-javascript/commit/cd4dea954b1797eb0e0fe2acd1b32ef75a3b7b65)) - package.json & package-lock.json to reduce vulnerabilities ([#​462](https://www.togithub.com/cloudevents/sdk-javascript/issues/462)) ([ae8fa79](https://www.github.com/cloudevents/sdk-javascript/commit/ae8fa799afea279adfbd1f35103fb168621c8a24)) ##### Documentation - add TS examples for CloudEvent usage ([#​461](https://www.togithub.com/cloudevents/sdk-javascript/issues/461)) ([c603831](https://www.github.com/cloudevents/sdk-javascript/commit/c603831e934c68c1f430708b5bff4dad938093dd)) - fix ts example ([#​467](https://www.togithub.com/cloudevents/sdk-javascript/issues/467)) ([349b84c](https://www.github.com/cloudevents/sdk-javascript/commit/349b84c3dad5d282d24780a884a0f94643871247)) ##### Miscellaneous - update readme with current Node LTS versions and add Node 16 to the testing matrix([#​465](https://www.togithub.com/cloudevents/sdk-javascript/issues/465)) ([8abbc11](https://www.github.com/cloudevents/sdk-javascript/commit/8abbc114af4b784c5061737f432f0af9ccb6c6f2))

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