Update Go version and dependencies

[ema-pe]

The DFaaS agent was built using Go 1.14, as specified in the go.mod. Since Go respects backward compatibility, I have built and run the agent with the latest Go version (1.23.3) without any problems. In any case, we should update the Go version to the latest, not only updating the go.mod file, but also considering any new features introduced in these versions that may be useful for the agent implementation.

We should also update the dependencies, the current versions have some known vulnerabilities (but this is not an important issue as the agent is a prototype). The update may also bring bug fixes, new features. In general, updating these dependencies should be no problem thanks to semantic versioning.

If possible, it is better to update a dependency one at a time, checking for any breaking changes or major releases.