fix: use existing Runner package for Amazon Linux 2023 as default

[kayman-mk]

Description

Since #1138 was merged, the runner_gitlab.runner_version was wrong. The mentioned package 15.8.2 does not exist for Amazon Linux 2023. This PR updates the default version to 16.0.3 the oldest available version.

You should never rely on the default value as your Runner has to match the GitLab version. See https://docs.gitlab.com/runner/#gitlab-runner-versions

Closes #1147

Migrations required

Usually not. In case you are still on GitLab < 16 you have to use the old AMI matching amzn2-ami-hvm-2.*-x86_64-ebs (used before #1138 was merged). Then you are able to still use an older version of the Runner.

Verification

• verified that 16.0.3 is available. Installation is done via

  curl --fail --retry 6 -L https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.rpm.sh | bash
  yum install gitlab-runner-${gitlab_runner_version} -y

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🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ COPYPASTE	jscpd	yes		no	1.62s
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✅ REPOSITORY	dustilock	yes		no	0.27s
✅ REPOSITORY	gitleaks	yes		no	1.3s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	12.29s
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✅ SPELL	cspell	2		0	2.66s
✅ TERRAFORM	terraform-fmt	1	0	0	0.06s

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