chore(deps): update zenika/kotlin docker tag to v1.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
zenika/kotlin	final	minor	1.3-jdk12-alpine → 1.4-jdk12-alpine

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[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   1   1   0	View in Orca
Passed	OSS Licenses	0   0   0   0	View in Orca
Passed	Malicious Packages	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

🛡️ The following IaC misconfigurations have been detected

	NAME	FILE
	Dockerfile Missing USER Instruction	detekt/Dockerfile	View in code
	HEALTHCHECK Instruction Missing	detekt/Dockerfile	View in code