.sync/Version.njk: Update Mu repos to Mu DevOps v9.1.6

[makubacki]

Changes since last release: https://github.com/microsoft/mu_devops/compare/v9.1.5...v9.1.6

General release info: https://github.com/microsoft/mu_devops/releases

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Includes:

• Sync RustSetupSteps.yml to use cargo-binstall to install cargo binary tools (#320)
• Update RustSetupSteps.yml (#321)
• Repo File Sync: synced file(s) with microsoft/mu_devops (#322)
• .sync/workflows/codeql: Use Version.njk cargo-make version (#323)

In particular, including #320 in this tag allows downstream repos to use the changes.