docs: add base sepolia contract addresses to README

[AustinGreen]

Motivation:

Updating the README.md to add our Base Sepolia contract addresses.

Modifications:

Added the Base Sepolia contract addresses to the deployment section.

Result:

Users will be able to find our Base Sepolia contract addresses.

[github-actions]

Coverage after merging austin/base-sepolia into main will be

88.52%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
LlamaCore.sol	99.31%	97.44%	100%	100%	299, 399
LlamaExecutor.sol	80%	50%	100%	100%	33
LlamaFactory.sol	100%	100%	100%	100%
LlamaLens.sol	72.09%	20%	100%	82.61%	174–175, 178, 178, 178–179, 179, 179–180, 180, 180, 188
LlamaPolicy.sol	91.53%	88.89%	94.59%	91.38%	353, 392, 392, 392–394, 394, 394, 396–399, 401, 419
LlamaPolicyMetadata.sol	100%	100%	100%	100%
src/accounts
LlamaAccount.sol	100%	100%	100%	100%
LlamaAccountWithDelegation.sol	100%	100%	100%	100%
src/lib
ERC721NonTransferableMinimalProxy.sol	70.42%	72.73%	72.73%	68.42%	102, 104, 106, 118–120, 190, 88, 88, 88, 90, 90, 90, 92, 92, 92, 97, 99
LlamaUtils.sol	100%	100%	100%	100%
PolicyholderCheckpoints.sol	55.88%	50%	81.82%	53.62%	130, 184–186, 186, 186–187, 189, 192, 222, 229, 229–231, 233, 233–235, 237, 237–239, 241, 241–243, 262, 265–271, 278, 46, 46–48, 48, 48–49, 51
SupplyCheckpoints.sol	57.14%	50%	83.33%	54.93%	131, 183–185, 185, 185–186, 188, 191, 235, 242, 242–244, 246, 246–248, 250, 250–252, 254, 254–256, 275, 278–284, 291, 50, 50–52, 52, 52–53, 55
src/llama-scripts
LlamaAccountTokenDelegationScript.sol	100%	100%	100%	100%
LlamaGovernanceScript.sol	96.24%	64.29%	100%	100%	131, 133, 160, 171, 228
LlamaInstanceConfigBase.sol	100%	100%	100%	100%
LlamaInstanceConfigScriptTemplate.sol	100%	100%	100%	100%
src/strategies/absolute
LlamaAbsolutePeerReview.sol	100%	100%	100%	100%
LlamaAbsoluteQuorum.sol	100%	100%	100%	100%
LlamaAbsoluteStrategyBase.sol	94.81%	87.50%	90.91%	98%	248, 251, 301
src/strategies/relative
LlamaRelativeHolderQuorum.sol	91.67%	75%	100%	100%	52, 59
LlamaRelativeQuantityQuorum.sol	0%	0%	0%	0%	28, 28, 28–30, 42, 42, 42–44, 51–52, 52, 52–53, 58–59, 59, 59–60
LlamaRelativeStrategyBase.sol	97.62%	90.91%	100%	100%	208, 310
LlamaRelativeUniqueHolderQuorum.sol	93.33%	83.33%	100%	100%	54, 61