Titan V2.3.0

New release of Flarestack v2 (Titan). The key change versus the previous release (v2.2.6) is the incorporation of specified versions for all python package dependencies in setup.py, ensuring better reproducibility in future. Going forward, these dependencies will be managed/updated by Dependabot.

In addition there were minor changes to replace use of np.float/np.bool, addressing deprecation warnings.