chore: verifying oppgaveId input to prevent server side request forgery #1226

Job	Run time
jar-app / Analyze (kotlin)	3m 8s
jar-app / Build	2m 22s
jar-app / Test	1m 58s
jar-app / Deploy to dev	3m 37s
jar-app / Deploy to prod	0s
jar-app / Trivy / trivy-test-docker	0s
	11m 5s

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