[Snyk] Fix for 5 vulnerabilities

[RealTschoegl]

Snyk has created this PR to fix 5 vulnerabilities in the yarn dependencies of this project.

Snyk changed the following file(s):

• package.json

Note for zero-installs users

If you are using the Yarn feature zero-installs that was introduced in Yarn V2, note that this PR does not update the .yarn/cache/ directory meaning this code cannot be pulled and immediately developed on as one would expect for a zero-install project - you will need to run yarn to update the contents of the ./yarn/cache directory.
If you are not using zero-install you can ignore this as your flow should likely be unchanged.

⚠️ Warning

Failed to update the yarn.lock, please update manually before merging.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Improper Certificate Validation SNYK-JS-NODEFORGE-15789771	848
	Improper Verification of Cryptographic Signature SNYK-JS-NODEFORGE-15789767	828
	Infinite loop SNYK-JS-NODEFORGE-15789769	828
	Improper Verification of Cryptographic Signature SNYK-JS-NODEFORGE-15789773	828
	Infinite loop SNYK-JS-BRACEEXPANSION-15789759	641

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Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Improper Verification of Cryptographic Signature

Note

Fix 5 vulnerabilities by upgrading webpack, eslint, and related dev dependencies

Updates several devDependencies in package.json to address 5 Snyk-reported vulnerabilities: webpack ^4 → ^5, webpack-dev-server ^3 → ^4, eslint ^4 → ^9, gh-pages ^1 → ^6, codesandboxer ^0.1 → ^0.5, and copy-webpack-plugin ^5 → ^7. Risk: major version jumps in webpack (v5), webpack-dev-server (v4), and eslint (v9) may require config or build script changes if breaking changes apply.

^{Macroscope summarized dafa2c2.}

[macroscopeapp]

Approvability

Verdict: Approved

This PR only updates devDependencies to address security vulnerabilities. Since all changes are to development/build tooling (eslint, webpack, etc.) with no runtime dependencies affected, there is no impact on the shipped library's behavior.

^{You can customize Macroscope's approvability policy. Learn more.}