fix: ensure feasible simulations of ecModels

[BenjaSanchez]

Hopefully closes DD-DeCaF/scrum#1217

Add a 5% to the minimal growth required by the flexibilization algorithm, to ensure simulations will work later on regardless of solver approximations.

[codecov-io]

Codecov Report

Merging #156 into devel will increase coverage by 0.28%. The diff coverage is 100%.

@@            Coverage Diff            @@
##            devel    #156      +/-   ##
=========================================
+ Coverage   75.52%   75.8%   +0.28%     
=========================================
  Files          20      21       +1     
  Lines         907     959      +52     
=========================================
+ Hits          685     727      +42     
- Misses        222     232      +10

Impacted Files	Coverage Δ
src/simulations/modeling/driven.py	87.7% <100%> (+0.1%)	:arrow_up:
src/simulations/resources.py	76.4% <0%> (-7.81%)	:arrow_down:
src/simulations/schemas.py	100% <0%> (ø)	:arrow_up:
src/simulations/modeling/community.py	96.87% <0%> (ø)
src/simulations/storage.py	84.31% <0%> (+0.31%)	:arrow_up:

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[ChristianLieven]

Stellar Job 🌟