chore: bump ethers.js version

[mds1]

Enables support for ENS names with emojis, ref ethers-io/ethers.js#2376

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[github-actions]

Coverage after merging chore/bump-ethers into master will be

85.97%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
contracts-periphery/src
UmbraBatchSend.sol	93.55%	100%	75%	94.74%	85
UniswapWithdrawHook.sol	77.78%	100%	50%	80%	44
umbra-js/src
ethers.ts	74.58%	100%	58.33%	100%
types.ts	50%	100%	0%	100%
umbra-js/src/classes
KeyPair.ts	98.65%	96.49%	100%	100%	31–32
RandomNumber.ts	100%	100%	100%	100%
StealthKeyRegistry.ts	100%	100%	100%	100%
TxHistoryProvider.ts	85.71%	86.67%	66.67%	87.50%	11, 26, 46, 50, 8
Umbra.ts	79.77%	74.19%	76%	83.66%	134–135, 211–212, 212–213, 222–223, 241, 287–290, 352, 360, 360–362, 364, 366, 386, 386, 386–387, 392–393, 396, 399, 415, 432–433, 481, 515, 532, 545–546, 556–557, 580–581, 657, 660, 660, 660, 663, 670, 670, 677, 681, 681, 681–682, 695, 699, 702–703, 709–711, 718, 718, 718–721
umbra-js/src/utils
cns.ts	50%	33.33%	50%	55%	33–36, 40, 40, 40, 40, 40–41, 44–46
constants.ts	100%	100%	100%	100%
ens.ts	36.11%	25%	33.33%	40%	25–27, 35, 56–57, 57, 57–58, 63–64, 66, 70, 70, 70, 70, 70–71, 75–77
utils.ts	81.29%	73.33%	86.67%	86.29%	107–109, 111–113, 119, 137–138, 185, 238, 264, 266–267, 276, 276, 276–277, 279, 282, 291–292, 336, 336, 336, 356, 385, 387, 392, 404, 404, 410, 412–413, 424–428, 434, 436, 478–479, 479, 479–481, 481, 481, 57–58, 581, 586, 83, 91, 91
umbra-js/test
testPrivateKeys.ts	100%	100%	100%	100%
utils.ts	100%	100%	100%	100%

[apbendi]

LGTM