add sudo apt-get update before sudo apt install

[zARODz11z]

What does this PR do?

Attempt to fix failing CI install cross build deps https://github.com/DataDog/datadog-lambda-python/runs/5487053064?check_suite_focus=true#step:4:20 based off this this issue actions/runner-images#675

Motivation

CI is failing

Testing Guidelines

Additional Notes

Types of Changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
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• This PR passes the integration tests (ask a Datadog member to run the tests)