[Snyk] Security upgrade keythereum from 0.4.6 to 0.4.9

[silemn]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • js-old/package.json
  • js-old/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	701/1000 Why? Recently disclosed, Has a fix available, CVSS 8.3	Improper Verification of Cryptographic Signature SNYK-JS-ELLIPTIC-8172694	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: keythereum

The new version differs by 32 commits.

• 2bdf6c4 Export and unit test str2buf and hex2utf16le; use Buffer.from instead of new Buffer
• 1483a7d Merge branch 'simplify-create'
• 8c57e13 Tweaked comments, randomBytes callback
• e2749bd Merge branch 'master' into simplify-create
• 8ab5590 Merge branch 'improvement/isCipherAvailable'
• 0b38e71 Linting
• ee4238a Merge branch 'master' into improvement/isCipherAvailable
• 6557352 Left-pad private keys to 32 bytes; added more privateKeyToAddress test cases
• 6629160 Merge branch 'remove-ethereumjs-util'
• 7a279ca Linting; fixed secp256k1 version number
• 2f5a2c1 Simplify `create`
• ecf0449 Remove ethereumjs-util
• e12b3e8 Simplify isCipherAvailable
• 59c68b9 Tweaked hex2utf16le length check
• 93aac75 Incremented version
• 8bf4337 Added dist folder to .npmignore
• 4f778a4 Merge branch 'simplify-hex2utf16le'
• 5798117 Added buffer length check to hex2utf16le
• 08d73eb Merge branch 'master' into simplify-hex2utf16le
• f59d7b3 Merge branch 'always-str2buf'
• 1dfd4df Merge branch 'master' into always-str2buf
• 9ba61fc Merge branch 'always-str2buf'
• 865a725 Use Buffer.isBuffer
• 19f0f57 Use isFunction

See the full diff

Check the changes in this PR to ensure they won't cause issues with your project.

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