use cache@v3

[danepowell]

---

name: 🐞 Bug Fix
about: actions/cache@v2 generates node version warnings
labels: bug

---

Found in symfony/symfony#49001

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Description

This PR [briefly explain what it does]

In case this PR introduced TypeScript/JavaScript code changes:

• I have written test cases for the changes in this pull request
• I have run npm run format before the commit.
• I have run npm run lint before the commit.
• I have run npm run release before the commit.
• npm test returns with no unit test errors and all code covered.

In case this PR edits any scripts:

• I have checked the edited scripts for syntax.
• I have tested the changes in an integration test (If yes, provide workflow link).

[shivammathur]

@danepowell Thanks!