[Security] Bump ssri from 5.1.0 to 5.3.0 in /react

[dependabot-preview]

Bumps ssri from 5.1.0 to 5.3.0. This update includes security fixes.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects ssri
index.js in the ssri module before 5.2.2 for Node.js is prone to a regular expression denial of service vulnerability in strict mode functionality via a long base64 hash string.

Affected versions: < 5.2.2

Changelog

Sourced from ssri's changelog.

5.3.0 (2018-03-13)

Features

• checkData: optionally throw when checkData fails (bf26b84)

5.2.4 (2018-02-16)

5.2.3 (2018-02-16)

Bug Fixes

• hashes: filter hash priority list by available hashes (2fa30b8)
• integrityStream: dedupe algorithms to generate (d56c654)

5.2.2 (2018-02-14)

Bug Fixes

• security: tweak strict SRI regex (#10) (d0ebcdc)

5.2.1 (2018-02-06)

5.2.0 (2018-02-06)

Features

• match: add integrity.match() (3c49cc4)

... (truncated)

Commits

• 0ae0c23 chore(release): 5.3.0
• bf26b84 feat(checkData): optionally throw when checkData fails
• d0f7429 chore(release): 5.2.4
• 38878b7 docs: integrityStream docs were wrong
• 5e6fcee chore(release): 5.2.3
• 58b8cfe test: use strict for test/create.js
• 2fa30b8 fix(hashes): filter hash priority list by available hashes
• d56c654 fix(integrityStream): dedupe algorithms to generate
• e3845d5 test: add tests for integrity-stream
• 0fb45e7 chore(release): 5.2.2
• Additional commits viewable in compare view

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[dependabot-preview]

Looks like ssri is no longer updatable, so this is no longer needed.