fix(oci): Http registry oci pull

[alex123012]

Description

when we try to pull trivy-db from http registry in an airgapped env we are getting the error:

2023-06-23T13:52:56.086+0300    INFO    Need to update DB
2023-06-23T13:52:56.086+0300    INFO    DB Repository: registry.quay:8080/security/trivy-db
2023-06-23T13:52:56.086+0300    INFO    Downloading DB...
true
true
2023-06-23T13:52:56.426+0300    FATAL   init error: DB error: failed to download vulnerability DB: database download error: OCI repository error: 1 error occurred:
        * Get "https://registry.quay:8080/v2/": http: server gave HTTP response to HTTPS client

This pr is fixing this issue.

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[knqyf263]

Thanks!