chore(deps): update dependency gcp-docuploader to v0.6.4 (#2169)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| gcp-docuploader | `==0.6.3` -> `==0.6.4` | [![age](https://badges.renovateapi.com/packages/pypi/gcp-docuploader/0.6.4/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/gcp-docuploader/0.6.4/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/gcp-docuploader/0.6.4/compatibility-slim/0.6.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/gcp-docuploader/0.6.4/confidence-slim/0.6.3)](https://docs.renovatebot.com/merge-confidence/) |

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