build: Switch to ubuntu-latest for builds

[feanil]

This code does not have any dependencies that are specific to any specific version of ubuntu. So instead of testing on a specific version and then needing to do work to keep the versions up-to-date, we switch to the ubuntu-latest target which should be sufficient for testing purposes.

This work is being done as a part of https://github.com/openedx/platform-roadmap/issues/377

closes https://github.com/openedx/frontend-component-cookie-policy-banner/issues/441

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.73%. Comparing base (6a34cfb) to head (2bd9f2d). Report is 4 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #443 +/- ## ======================================= Coverage 73.73% 73.73% ======================================= Files 3 3 Lines 99 99 Branches 29 29 ======================================= Hits 73 73 Misses 20 20 Partials 6 6 ```

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[edx-semantic-release]

:tada: This PR is included in version 2.5.0 :tada:

The release is available on:

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

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