chore: harden browser-test installation

[naugtur]

Description

• blocks all git dependencies
• pins playwright to a non-vulnerable version

Security Considerations

• attacks via nested git dependencies become impossible

Scaling Considerations

Documentation Considerations

Testing Considerations

Compatibility Considerations

• we didn't have any git dependencies in our dependency tree
• playwright update might break something in CI

Upgrade Considerations

[changeset-bot]

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Latest commit: 5f86a8f

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