chore(build) Bump alpine version from 3.14.8 to 3.18.4

[emiran-orange]

Why is this PR required? What issue does it fix?:

Current Alpine version contains vulnerabilities. Fixes #262

What this PR does?:

Updates Alpine version from 3.14.8 to 3.18.4

Does this PR require any upgrade changes?: No

If the changes in this PR are manually verified, list down the scenarios covered:: N/A

Any additional information for your reviewer? : N/A

Checklist:

• [x] Fixes #262
• [x] PR Title follows the convention of <type>(<scope>): <subject>
• [ ] Has the change log section been updated?
• [ ] Commit has unit tests
• [ ] Commit has integration tests
• [ ] (Optional) Are upgrade changes included in this PR? If not, mention the issue/PR to track:
• [ ] (Optional) If documentation changes are required, which issue on https://github.com/openebs/openebs-docs is used to track them