chore(python): Update the python version in docs presubmit to use 3.10 (#773)

* chore(python): Update the python version in docs presubmit to use 3.10

Source-Link: https://github.com/googleapis/synthtool/commit/de3def663b75d8b9ae1e5d548364c960ff13af8f
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:a1c5112b81d645f5bbc4d4bbc99d7dcb5089a52216c0e3fb1203a0eeabadd7d5

* See https://github.com/googleapis/synthtool/pull/2047

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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Anthonios Partheniou <partheniou@google.com>
4 files changed