Updates alpine to v3.18

Before:

❯ trivy image --scanners vuln pipelinecomponents/ansible-lint
<...>
pipelinecomponents/ansible-lint (alpine 3.17.4)
===============================================
Total: 7 (UNKNOWN: 0, LOW: 0, MEDIUM: 6, HIGH: 1, CRITICAL: 0)
<...>
Python (python-pkg)
===================
Total: 5 (UNKNOWN: 0, LOW: 1, MEDIUM: 2, HIGH: 1, CRITICAL: 1)

After:

❯ trivy image --scanners vuln registry.gitlab.com/reitzig/ansible-lint/build:amd64-499940cc49ba21813750e6c5dcc613dd4d4deee3@sha256:eb593a1b08d1573dc9b23d10fab9b63471931e6c246755d6a7b054d86304edb4
<...>
registry.gitlab.com/reitzig/ansible-lint/build:amd64-499940cc49ba21813750e6c5dcc613dd4d4deee3@sha256:eb593a1b08d1573dc9b23d10fab9b63471931e6c246755d6a7b054d86304edb4 (alpine 3.18.3)
====================================================
Total: 0 (UNKNOWN: 0, LOW: 0, MEDIUM: 0, HIGH: 0, CRITICAL: 0)
<...>
Python (python-pkg)
===================
Total: 2 (UNKNOWN: 0, LOW: 0, MEDIUM: 2, HIGH: 0, CRITICAL: 0)

Side note: Apparently, the scanning pipeline breaks in some cases? pipeline-components/ansible-lint#4678714338