What problem are you trying to solve?

In order to support new Secondary Validators implemented in dd_sds, we need to bump the version of dd_sds. However, the current version of dd_sds has been updated to use Rust 1.90, but datadog-static-analyzer is still using Rust 1.86. Attempting to bump the dd_sds dependency directly results in build incompatibilities due to the compiler version mismatch.

What is your solution?

This PR updates the Rust toolchain version from 1.86 to 1.91.1 (the latest stable version). This ensures compatibility with the new version of dd_sds and resolves the build issues encountered when trying to update the library.
After updating the toolchain, the dependency on dd_sds was successfully bumped, and the code compiles and runs as expected.

Alternatives considered

• Downgrading dd_sds: Not viable, as it would prevent us from taking advantage of the latest improvements and security updates in the library.
• Manually patching dd_sds for 1.86 compatibility: Would introduce unnecessary maintenance overhead and diverge from the upstream version.
• Upgrading only to Rust 1.90: Since 1.91.1 is the latest stable release, it’s preferable to stay current with the toolchain to minimize future upgrade friction.

What the reviewer should know