[Snyk] Security upgrade @google-cloud/datastore from 2.0.0 to 3.1.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	768/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.5	Regular Expression Denial of Service (ReDoS) SNYK-JS-AXIOS-1579269	Yes	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: @google-cloud/datastore

The new version differs by 77 commits.

• 9933893 Release v3.1.0 (#327)
• 7d9f77f build: create docs test npm scripts (#328)
• 8a99d56 refactor: clean up types for tests (#325)
• 9b39431 refactor: asyncify the system test (#324)
• e8c72a2 build: test using @ grpc/grpc-js in CI (#323)
• a2acca3 refactor(types): enable noImplicitAny for transaction.ts & request.ts (#305)
• dc66029 docs: update contributing path in README (#322)
• 315207a chore: move CONTRIBUTING.md to root (#321)
• f45a5c0 docs: add lint/fix example to contributing guide (#319)
• 95e127b Automerge by dpebot
• a61b680 fix(deps): update dependency google-gax to ^0.25.0 (#316)
• fd8248f docs(samples): Update Datastore snippet for read only transaction
• a5cf576 chore(deps): update dependency eslint-config-prettier to v4 (#313)
• 98e5899 feat: typings for gapic files (#307)
• 61b4114 fix(deps): update dependency google-gax to ^0.24.0 (#312)
• 860e209 build: ignore googleapis.com in doc link check (#311)
• 51a5ce5 fix(types): Make gaxOptions optional in Transaction.rollback() (#310)
• 4cd6019 docs(key): copy Datastore#key examples to Key ctor (#306)
• 8a4a985 fix(deps): update dependency google-auth-library to v3 (#302)
• f8a5240 chore: update year in the license headers. (#304)
• 401b2e1 Release v3.0.1 (#301)
• 177b11b fix: ship the build directory (#300)
• 70ea500 build: check broken links in generated docs (#292)
• f839e58 Release v3.0.0 (#298)

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