chore(deps): consolidate and bump all dependencies

[ryanio]

Summary

• Bumps all dependencies to latest compatible major versions
• Migrates from deprecated .eslintrc.js to ESLint flat config (eslint.config.mjs)
• Modernizes husky pre-commit hook (removes deprecated husky.sh sourcing)
• Removes deprecated git add from lint-staged config
• Fixes lint issues surfaced by updated rules
• Bumps package version from 4.0.6 → 4.0.7

Key dependency updates

Package	From	To
eslint	^8	^9 (flat config)
typescript-eslint	^7	^8
c8	^10	^11
concurrently	^8	^9
eslint-config-prettier	^9	^10
eslint-plugin-promise	^6	^7
sinon	^18	^19
typescript	^5.0	^5.9
prettier	^3.0	^3.8
ethers	^6.9	^6.16
hardhat	^2.22	^2.28

Not bumped (breaking changes require separate migration)

• hardhat v3: Complete plugin system rewrite, config format changes
• chai v6: ESM-only, incompatible with CommonJS project setup
• eslint v10: Plugin ecosystem not yet compatible

Test plan

• All 112 tests passing
• ESLint passes with 0 warnings
• TypeScript type checking passes
• Build succeeds
• CI passes

🤖 Generated with Claude Code

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	typescript-eslint@​8.57.0
	concurrently@​8.2.2 ⏵ 9.2.1	+1		+1
	c8@​10.1.3 ⏵ 11.0.0
	eslint-config-prettier@​9.1.2 ⏵ 10.1.8	+1		+29
	sinon@​18.0.1 ⏵ 19.0.5	+1		+1	-5
	eslint@​8.57.1 ⏵ 9.39.4	+1		+1	+47
	prettier@​3.3.2 ⏵ 3.8.1
	@​eslint/​js@​8.57.1 ⏵ 9.39.4			+14

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