chore(rln): Release v0.4.2

[rymnc]

No description provided.

[github-actions]

Benchmark for 451ee47

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Test	Base	PR	%
Pmtree::compute_root	0.0±0.00ns	0.0±0.00ns	NaN%
Pmtree::get	324.4±3.72ns	323.3±4.34ns	-0.34%
Pmtree::override_range	230.2±5.53µs	230.8±4.25µs	+0.26%
Pmtree::set	54.4±0.54µs	54.6±1.29µs	+0.37%
Pmtree:delete	56.0±0.32µs	54.2±0.43µs	-3.21%

[github-actions]

Benchmark for 451ee47

Click to view benchmark

Test	Base	PR	%
FullMerkleTree::compute_root	0.0±0.00ns	0.0±0.00ns	NaN%
FullMerkleTree::delete	876.5±8.00ns	877.0±6.96ns	+0.06%
FullMerkleTree::get	3.4±0.04ns	3.4±0.08ns	0.00%
FullMerkleTree::override_range	2.2±0.03µs	2.2±0.02µs	0.00%
FullMerkleTree::set	890.4±3.97ns	878.1±11.28ns	-1.38%
OptimalMerkleTree::compute_root	1041.8±7.90ns	1045.7±12.74ns	+0.37%
OptimalMerkleTree::delete	1035.8±7.85ns	1050.7±95.13ns	+1.44%
OptimalMerkleTree::get	22.7±0.28ns	23.3±0.35ns	+2.64%
OptimalMerkleTree::override_range	5.2±0.08µs	5.3±0.18µs	+1.92%
OptimalMerkleTree::set	1036.6±8.32ns	1025.8±9.67ns	-1.04%