ci(azure-pipelines.yml): change the Ubuntu VM to 'latest'

[dmwelch]

• Changes Ubuntu VM to no longer point to deprecated VM (https://github.com/actions/virtual-environments/tree/df27520b1f223f23188191ec1a3fdce76f5cddd8#available-environments)

[github-actions[bot]]

:tada: This PR is included in version 4.2.5 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: