Update regex minimum version

[vEpiphyte]

Addresses segfault reported here mrabarnett/mrab-regex#479

[codecov]

Codecov Report

Base: 97.11% // Head: 97.01% // Decreases project coverage by -0.10% ⚠️

Coverage data is based on head (8920b3c) compared to base (127831e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2841      +/-   ##
==========================================
- Coverage   97.11%   97.01%   -0.11%     
==========================================
  Files         214      214              
  Lines       41554    41539      -15     
==========================================
- Hits        40354    40297      -57     
- Misses       1200     1242      +42     

Flag	Coverage Δ
linux	97.01% <ø> (-0.01%)	⬇️
linux_replay	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
synapse/tests/utils.py	94.51% <0.00%> (-1.91%)	⬇️
synapse/cortex.py	96.71% <0.00%> (-0.55%)	⬇️
synapse/lib/hiveauth.py	95.71% <0.00%> (-0.52%)	⬇️
synapse/lib/trigger.py	94.98% <0.00%> (-0.39%)	⬇️
synapse/lib/view.py	96.98% <0.00%> (-0.34%)	⬇️
synapse/cmds/cron.py	97.56% <0.00%> (-0.25%)	⬇️
synapse/lib/jsonstor.py	98.30% <0.00%> (-0.25%)	⬇️
synapse/lib/base.py	95.73% <0.00%> (-0.07%)	⬇️
synapse/lib/layer.py	96.99% <0.00%> (-0.05%)	⬇️
synapse/lib/chop.py	98.00% <0.00%> (-0.04%)	⬇️
... and 8 more

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