Project stack update

[szymon-owczarzak]

Changes

• Gradle wrapper updated from v5.6.4 to v6.8.3
• Gradle Java Toolchain added - set to JDK 8
• Gradle Node plugin updated from v1.2.0 to v1.3.1
• Gradle Kotlin plugin updated from v1.3.61 to v1.4.32
• Gradle Docker plugin updated from v6.1.2 to v6.7.0
• Gradle Detekt plugin updated from v1.1.0 to v1.16.0

Types of changes

• Dependency update
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• Automated functional tests have been added or modified to cover my changes (if applicable)
• I have updated the documentation accordingly.

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