[Security] Bump elliptic from 6.5.2 to 6.5.3

[dependabot-preview[bot]]

Bumps elliptic from 6.5.2 to 6.5.3. This update includes a security fix.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Signature Malleabillity in elliptic The Elliptic package before version 6.5.3 for Node.js allows ECDSA signature malleability via variations in encoding, leading '\0' bytes, or integer overflows. This could conceivably have a security-relevant impact if an application relied on a single canonical signature.

Affected versions: < 6.5.3

Commits

• 8647803 6.5.3
• 856fe4d signature: prevent malleability and overflows
• See full diff in compare view

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[dependabot-preview[bot]]

Dependabot tried to add @qvantor and @KateNegrienko as reviewers to this PR, but received the following error from GitHub:

POST https://api.github.com/repos/exonum/exonum-client/pulls/187/requested_reviewers: 422 - Reviews may only be requested from collaborators. One or more of the users or teams you specified is not a collaborator of the exonum/exonum-client repository. // See: https://developer.github.com/v3/pulls/review_requests/#create-a-review-request

[coveralls]

Coverage remained the same at 93.203% when pulling e1055916e62108885407c0086bcf86f26023caf0 on dependabot/npm_and_yarn/elliptic-6.5.3 into fa9be044bcb0411dde3b2a3b7f548441cac61b4c on master.

[aleksuss]

@dependabot squash and merge