Update Snowflake-Labs/snowflake requirement from ~> 0.90.0 to ~> 0.91.0

Updates the requirements on [Snowflake-Labs/snowflake](https://github.com/Snowflake-Labs/terraform-provider-snowflake) to permit the latest version.
- [Release notes](https://github.com/Snowflake-Labs/terraform-provider-snowflake/releases)
- [Changelog](https://github.com/Snowflake-Labs/terraform-provider-snowflake/blob/main/CHANGELOG.md)
- [Commits](Snowflake-Labs/terraform-provider-snowflake@v0.90.0...v0.91.0)

---
updated-dependencies:
- dependency-name: Snowflake-Labs/snowflake
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

main.tf

@@ -7,7 +7,7 @@ terraform {
     }
     snowflake = {
       source  = "Snowflake-Labs/snowflake"
-      version = "~> 0.90.0"
+      version = "~> 0.91.0"
     }
   }
 }