B/reg term bugfix

[jwilles]

This pull request includes a version bump for the vbll package and minor fixes to the loss function calculations in two files to ensure proper operator precedence. Below is a summary of the changes:

Version Update:

• Updated the version of the vbll package from 0.4.8 to 0.4.9 in both pyproject.toml and setup.py. [1] [2]

Bug Fixes:

• Corrected operator precedence in the loss_fn function in vbll/layers/classification.py by adding parentheses around (kl_term_ll + kl_term_noise) to ensure proper calculation of the regularization term.
• Applied the same fix for operator precedence in the loss_fn function in vbll/layers/regression.py.