Apt Get Install Pin Version Not Defined @ /Dockerfile

[YSLCx]

Checkmarx (IaC-Security): Apt Get Install Pin Version Not Defined
Checkmarx Project: YSLCx/workshop_demo
Repository URL: https://github.com/YSLCx/workshop_demo
Branch: main
Scan ID: 85f0b871-dd27-420e-95e1-91e06302f579

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When installing a package, its pin version should be defined

Locations:

Result #1:
Severity: MEDIUM
State: TO_VERIFY
Status: RECURRENT
    File: /Dockerfile[5,0]
    Expected value: Package 'maven' has version defined
    Actual value: Package 'maven' does not have version defined
    Review result in Checkmarx One: Apt Get Install Pin Version Not Defined