v2.9.15-canary.7

<!-- Release notes generated using configuration in .github/release.yml at v2.9.15-canary.7 -->

What's Changed

Changelog

• release(turborepo): 2.9.15-canary.6 by @github-actions[bot] in https://github.com/vercel/turborepo/pull/12925
• fix: Restore release PR auto-merge by @anthonyshew in https://github.com/vercel/turborepo/pull/12927
• perf: Index repo gitignore matchers by @anthonyshew in https://github.com/vercel/turborepo/pull/12928
• ci: Disable incremental Rust test builds by @anthonyshew in https://github.com/vercel/turborepo/pull/12929
• perf: Trim OpenTelemetry crate features by @anthonyshew in https://github.com/vercel/turborepo/pull/12930
• perf: Trim microfrontends proxy HTTP features by @anthonyshew in https://github.com/vercel/turborepo/pull/12931
• fix: Accept experimentalCI object config by @anthonyshew in https://github.com/vercel/turborepo/pull/12934

Full Changelog: https://github.com/vercel/turborepo/compare/v2.9.15-canary.6...v2.9.15-canary.7