Update dependency @google-cloud/pubsub to v2

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This PR contains the following updates:

Package	Type	Update	Change
@google-cloud/pubsub	dependencies	major	^1.7.3 -> ^2.0.0

By merging this PR, the below vulnerabilities will be automatically resolved:

Severity	CVSS Score	CVE
Critical	9.8	CVE-2020-7720
High	7.5	CVE-2020-8237
High	7.5	CVE-2022-24771
High	7.5	CVE-2022-24772
Medium	6.6	WS-2022-0008
Medium	6.1	CVE-2022-0122
Medium	5.3	CVE-2022-24773

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Release Notes

googleapis/nodejs-pubsub (@​google-cloud/pubsub)

v2.0.0

Compare Source

Please note that Node 8 is no longer supported, and Node 10 is the new minimum version of the runtime.

⚠ BREAKING CHANGES

• Please note that Node 8 is no longer supported, and Node 10 is the new minimum version of the runtime.
• drop support for custom promises (#​970)
• convert to typescript (#​923)
• deps: update dependency @​google-cloud/projectify to v2 (#​929)

Bug Fixes

• docs: link to correct gaxOptions docs (#​999) (312e318)
• regen protos and tests, formatting (#​991) (e350b97)
• remove eslint, update gax, fix generated protos, run the generator (#​955) (544a061)
• remove unused dependencies (#​998) (7b242a3)
• close: ensure in-flight messages are drained (#​952) (93a2bd7)
• deps: update dependency @​google-cloud/paginator to v3 (#​931) (b621854)
• deps: update dependency @​google-cloud/precise-date to v2 (#​934) (72b8d78)
• deps: update dependency @​google-cloud/projectify to v2 (#​929) (45d9880)
• deps: update dependency @​google-cloud/promisify to v2 (#​928) (3819877)
• deps: update dependency google-auth-library to v6 (#​935) (73fc887)

Build System

• convert to typescript (#​923) (2fc68ba)

Miscellaneous Chores

• drop support for custom promises (#​970) (df462d3)

1.7.1 (2020-04-06)

Bug Fixes

• provide missing close() method in the generated gapic client (#​941) (6bf8f14)

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⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

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The artifact failure details are included below:

File name: firebase/JavaScript/functions/package-lock.json

No /opt/buildpack/tools/npm/6.14.18/bin defined - aborting