Remove old lockfiles

[sarah-witt]

What does this PR do?

Removes old lockfiles

Motivation

We renamed them to *_3.12.txt so we don't use these anymore. This cleans up the .deps/resolved directory and makes it more clear which files are needed for the final build.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[alopezz]

👍

For extra context:

• We didn't rename the files to py3.12 but rather created a new set of files to reflect the change of minor version, because the packages we do build are tied to a minor version and thus when we were bumping the minor version we would break the datadog-agent repo. This might become less necessary now that we pin integrations-core, though.
• We never ended up using the py2 files in any release, as we ended up freezing Agent 6 at 6.53, which still used the "old" way of building dependencies (i.e. building them within the Agent pipeline).