fix: update predicateType to v0.2 in vulnerability attestations

[gaganhr94]

Description of the PR

Observed that the upstream PRs mentioned in the TODO were fixed. So went ahead to move the predicateType to v0.2. Hopefully this should also solve the issue #1242 completely.

Fixes #1242

PR Checklist

• All commits have a Developer Certificate of Origin (DCO) -- they are generated using -s flag to git commit.
• All new changes are covered by tests
• If GraphQL schema is changed, make generate has been run
• If GraphQL schema is changed, GraphQL client updates/additions have been made
• If OpenAPI spec is changed, make generate has been run
• If ent schema is changed, make generate has been run
• If collectsub protobuf has been changed, make proto has been run
• All CI checks are passing (tests and formatting)
• All dependent PRs have already been merged