[CI] Fix test_linux step in conda-packages workflow

[oleksandr-pavlyk]

This PR fixed "conda-packages.yam" workflow by using apt update --fix-missing before doing apt install gdb which errors out with status code 404.

• Have you provided a meaningful PR description?
• Have you added a test, reproducer or referred to an issue with a reproducer?
• Have you tested your changes locally for CPU and GPU devices?
• Have you made sure that new changes do not introduce compiler warnings?
• Have you checked performance impact of proposed changes?
• If this PR is a work in progress, are you opening the PR as a draft?

[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/1429/index.html

[coveralls]

coverage: 85.909%. remained the same when pulling 2c757d4 on fix-gdb-installation into dfba436 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.15.1dev0=py310ha25a700_4 ran successfully.
Passed: 935
Failed: 65
Skipped: 119