Update aiohttp min version (SYN-2963)

[vEpiphyte]

Avoids aio-libs/aiohttp#4818

[codecov]

Codecov Report

Merging #2495 (8c35886) into master (e7478e5) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2495      +/-   ##
==========================================
- Coverage   97.18%   97.04%   -0.14%     
==========================================
  Files         194      194              
  Lines       36435    36435              
==========================================
- Hits        35411    35360      -51     
- Misses       1024     1075      +51     

Flag	Coverage Δ
linux	97.04% <ø> (-0.02%)	⬇️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/slabseqn.py	94.97% <0.00%> (-3.36%)	⬇️
synapse/tests/utils.py	94.00% <0.00%> (-2.05%)	⬇️
synapse/lib/hiveauth.py	96.28% <0.00%> (-0.71%)	⬇️
synapse/cortex.py	96.22% <0.00%> (-0.66%)	⬇️
synapse/lib/view.py	94.43% <0.00%> (-0.62%)	⬇️
synapse/lib/trigger.py	94.88% <0.00%> (-0.40%)	⬇️
synapse/lib/layer.py	97.85% <0.00%> (-0.17%)	⬇️

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[vEpiphyte]

Closing this at the moment.