fix: convert the fleet instance type in migration script

[kayman-mk]

Description

The instance types for the fleet are not converted. In this case the module uses a default value m5.large. So all created instances are m5.large instances which is usually not wanted.

If the migration script was used to convert the module call to version 7, it is very likely that you find the following in your module call:

runner_instance = {
    docker_machine_types_fleet = ["t3.medium"] # your instance types here
}

The variable docker_machine_types_fleet does not exist, but Terraform does not report an error.

This PR fixes the migration script and produces the following correct code:

runner_worker_docker_machine_instance = {
  types                    = ["t3.medium"]
}

Migrations required

No

Verification

Verified locally that the script produces the output as described above.

[github-actions]

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[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ BASH	bash-exec	1		0	0.01s
✅ BASH	shellcheck	1		0	0.51s
✅ BASH	shfmt	1	1	0	0.06s
✅ COPYPASTE	jscpd	yes		no	2.5s
✅ REPOSITORY	checkov	yes		no	21.74s
✅ REPOSITORY	dustilock	yes		no	0.28s
✅ REPOSITORY	gitleaks	yes		no	0.99s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	15.33s
✅ REPOSITORY	secretlint	yes		no	1.53s
✅ REPOSITORY	syft	yes		no	0.21s
✅ REPOSITORY	trivy-sbom	yes		no	1.29s
✅ REPOSITORY	trufflehog	yes		no	5.36s
✅ SPELL	cspell	2		0	3.22s

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