This commit introduces a TOML catalog for managing dependencies and plugins, replacing inline version definitions.
It updates build scripts across the project to utilize the catalog, promoting consistency and simplifying dependency management.
Additionally, it configures repositories for plugin and dependency resolution in the settings file.

This commit updates several dependencies, including:
- Bumping BouncyCastle from 1.76 to 1.79
- Bumping kotlinx.datetime from 0.5.0 to 0.6.1
- Bumping Dokka from 1.8.10 to 1.9.20
- Bumping Kotlin from 1.9.22 to 1.9.25
- Bumping Krypto from 4.0.9 to 4.0.10
- Bumping MiniDNS from 1.0.3 to 1.1.1

It also updates the CI workflows to use:
- `actions/checkout@v4`
- `gradle/gradle-build-action@3`

I submit my source code and allow Tigase to release the code as a part of Tigase's own software package under any license, either an open source or closed source.