fix(rln): use tree_height_20 artifacts from ceremony

[rymnc]

• fix(rln): use artifacts from ceremony

[github-actions]

Benchmark for 948b090

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Test	Base	PR	%
FullMerkleTree::delete	1658.3±104.75ns	1678.9±99.01ns	+1.24%
FullMerkleTree::get	5.1±0.38ns	5.2±0.29ns	+1.96%
FullMerkleTree::override_range	4.2±0.22µs	4.4±0.26µs	+4.76%
FullMerkleTree::set	1661.1±76.80ns	1683.5±88.43ns	+1.35%
OptimalMerkleTree::compute_root	1869.9±94.07ns	1778.3±81.18ns	-4.90%
OptimalMerkleTree::delete	1882.5±111.30ns	1850.4±87.84ns	-1.71%
OptimalMerkleTree::get	35.3±2.01ns	32.5±1.09ns	-7.93%
OptimalMerkleTree::override_range	9.4±0.46µs	10.0±1.04µs	+6.38%
OptimalMerkleTree::set	1847.9±118.90ns	1797.8±56.18ns	-2.71%

[github-actions]

Benchmark for 948b090

Click to view benchmark

Test	Base	PR	%
Pmtree::compute_root	2.5±0.05ns	2.0±0.03ns	-20.00%
Pmtree::get	547.3±4.18ns	532.6±5.38ns	-2.69%
Pmtree::override_range	214.7±10.36µs	212.6±14.26µs	-0.98%
Pmtree::set	83.2±1.43µs	82.0±0.87µs	-1.44%
Pmtree:delete	83.7±0.67µs	82.5±0.64µs	-1.43%