chore: drop evm versions through istanbul

[charles-cooper]

What I did

drop pre-istanbul versions. actually, per #3365, we could drop everything pre-paris, but brownie still defaults to evm_version: istanbul, and i'm not sure we want to break that. (actually, maybe we do want to drop istanbul because then brownie users would stop trying to verify contracts compiled for istanbul, and would instead explicitly set the evm version to something more recent).

How I did it

How to verify it

Commit message

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Description for the changelog

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[codecov-commenter]

Codecov Report

Merging #3470 (258b6a6) into master (66b9670) will decrease coverage by 36.15%.
The diff coverage is 72.72%.

❗ Current head 258b6a6 differs from pull request most recent head c5c4f7d. Consider uploading reports for the commit c5c4f7d to get more accurate results

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@@             Coverage Diff             @@
##           master    #3470       +/-   ##
===========================================
- Coverage   89.30%   53.16%   -36.15%     
===========================================
  Files          84       84               
  Lines       10792    10778       -14     
  Branches     2461     2456        -5     
===========================================
- Hits         9638     5730     -3908     
- Misses        756     4534     +3778     
- Partials      398      514      +116     

Impacted Files	Coverage Δ
vyper/cli/vyper_compile.py	17.64% <ø> (-50.74%)	⬇️
vyper/cli/vyper_json.py	9.31% <0.00%> (-69.32%)	⬇️
vyper/codegen/expr.py	38.69% <ø> (-49.01%)	⬇️
vyper/codegen/external_call.py	18.91% <ø> (-78.38%)	⬇️
vyper/codegen/arithmetic.py	65.78% <50.00%> (-20.20%)	⬇️
vyper/codegen/core.py	51.34% <100.00%> (-35.41%)	⬇️
vyper/evm/opcodes.py	90.69% <100.00%> (-9.31%)	⬇️
vyper/ir/optimizer.py	77.77% <100.00%> (-20.43%)	⬇️

... and 60 files with indirect coverage changes

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