Bump FL to version 0.11.4

[ThijsvdLaar]

For ease of reference, some recent papers require a new release of ForneyLab to refer to. @albertpod would you be so kind to work the release magic?

Changes include:

• The introduction of pointmass-constraints, as described in (Senoz et al., 2021, "Variational message passing and local constraint manipulation in factor graphs")
• The introduction of a transition mixture node
• The introdcution of moment- and chance-constraints as described in (van de Laar et al., 2021, "Chance-Constrained Active Inference")
• Refactoring of dimensionality and variate type handling

[codecov-commenter]

Codecov Report

Merging #190 (92cbafe) into master (fc11951) will increase coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
+ Coverage   86.59%   86.63%   +0.04%     
==========================================
  Files          95       95              
  Lines        4400     4400              
==========================================
+ Hits         3810     3812       +2     
+ Misses        590      588       -2     

Impacted Files	Coverage Δ
src/engines/julia/generators.jl	97.67% <0.00%> (+1.16%)	:arrow_up:

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