fix: import long type into proto ts declaration file

[yoshi-automation]

This PR was generated using Autosynth. :rainbow:

Log from Synthtool

``` synthtool > Executing /tmpfs/src/git/autosynth/working_repo/synth.py. synthtool > Ensuring dependencies. synthtool > Pulling artman image. latest: Pulling from googleapis/artman Digest: sha256:c773192618c608a7a0415dd95282f841f8e6bcdef7dd760a988c93b77a64bd57 Status: Image is up to date for googleapis/artman:latest synthtool > Cloning googleapis. synthtool > Running generator for google/cloud/webrisk/artman_webrisk_v1beta1.yaml. synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/js/webrisk-v1beta1. .eslintignore .eslintrc.yml .github/ISSUE_TEMPLATE/bug_report.md .github/ISSUE_TEMPLATE/feature_request.md .github/ISSUE_TEMPLATE/support_request.md .github/PULL_REQUEST_TEMPLATE.md .github/release-please.yml .jsdoc.js .kokoro/common.cfg .kokoro/continuous/node10/common.cfg .kokoro/continuous/node10/docs.cfg .kokoro/continuous/node10/lint.cfg .kokoro/continuous/node10/samples-test.cfg .kokoro/continuous/node10/system-test.cfg .kokoro/continuous/node10/test.cfg .kokoro/continuous/node12/common.cfg .kokoro/continuous/node12/test.cfg .kokoro/continuous/node8/common.cfg .kokoro/continuous/node8/test.cfg .kokoro/docs.sh .kokoro/lint.sh .kokoro/presubmit/node10/common.cfg .kokoro/presubmit/node10/docs.cfg .kokoro/presubmit/node10/lint.cfg .kokoro/presubmit/node10/samples-test.cfg .kokoro/presubmit/node10/system-test.cfg .kokoro/presubmit/node10/test.cfg .kokoro/presubmit/node12/common.cfg .kokoro/presubmit/node12/test.cfg .kokoro/presubmit/node8/common.cfg .kokoro/presubmit/node8/test.cfg .kokoro/presubmit/windows/common.cfg .kokoro/presubmit/windows/test.cfg .kokoro/publish.sh .kokoro/release/docs.cfg .kokoro/release/docs.sh .kokoro/release/publish.cfg .kokoro/samples-test.sh .kokoro/system-test.sh .kokoro/test.bat .kokoro/test.sh .kokoro/trampoline.sh .nycrc .prettierignore .prettierrc CODE_OF_CONDUCT.md CONTRIBUTING.md LICENSE README.md codecov.yaml renovate.json samples/README.md npm WARN npm npm does not support Node.js v12.13.0 npm WARN npm You should probably upgrade to a newer version of node as we npm WARN npm can't make any promises that npm will work with this version. npm WARN npm Supported releases of Node.js are the latest release of 6, 8, 9, 10, 11. npm WARN npm You can find the latest version at https://nodejs.org/ > protobufjs@6.8.8 postinstall /tmpfs/src/git/autosynth/working_repo/node_modules/protobufjs > node scripts/postinstall npm notice created a lockfile as package-lock.json. You should commit this file. added 510 packages from 787 contributors and audited 1023 packages in 10.982s found 0 vulnerabilities npm WARN npm npm does not support Node.js v12.13.0 npm WARN npm You should probably upgrade to a newer version of node as we npm WARN npm can't make any promises that npm will work with this version. npm WARN npm Supported releases of Node.js are the latest release of 6, 8, 9, 10, 11. npm WARN npm You can find the latest version at https://nodejs.org/ > @google-cloud/web-risk@1.3.2 fix /tmpfs/src/git/autosynth/working_repo > eslint . --fix synthtool > Cleaned up 2 temporary directories. synthtool > Wrote metadata to synth.metadata. ```

[codecov[bot]]

Codecov Report

Merging #77 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #77   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          82     82           
=====================================
  Hits           82     82

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