cmake: Upgrade intx to v0.12.0

[chfast]

This version has _u384 literal suffix
and using namespace intx::literals as an alternative to using namespace intx.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.08%. Comparing base (ec2fa02) to head (610dff3).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #985   +/-   ##
=======================================
  Coverage   94.08%   94.08%           
=======================================
  Files         144      144           
  Lines       16202    16203    +1     
=======================================
+ Hits        15244    15245    +1     
  Misses        958      958           

Flag	Coverage Δ
eof_execution_spec_tests	16.65% <0.00%> (-0.01%)	⬇️
ethereum_tests	26.56% <25.00%> (+<0.01%)	⬆️
ethereum_tests_silkpre	18.62% <25.00%> (ø)
execution_spec_tests	17.72% <25.00%> (+<0.01%)	⬆️
unittests	89.54% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
lib/evmone_precompiles/ecc.hpp	100.00% <100.00%> (ø)
test/unittests/evm_eip7516_blobbasefee_test.cpp	100.00% <ø> (ø)
test/unittests/evmmax_bn254_add_test.cpp	100.00% <ø> (ø)
test/unittests/evmmax_bn254_mul_test.cpp	100.00% <ø> (ø)
test/unittests/evmmax_test.cpp	96.55% <ø> (ø)
test/unittests/state_block_test.cpp	100.00% <ø> (ø)
test/unittests/state_mpt_hash_test.cpp	99.11% <ø> (ø)
test/unittests/state_mpt_test.cpp	100.00% <ø> (ø)
test/unittests/statetest_loader_tx_test.cpp	100.00% <ø> (ø)
test/unittests/tracing_test.cpp	100.00% <100.00%> (ø)