[nix] Test devbox on latest nix (#2670)

## Summary

## How was it tested?

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Author: mikeland73

.github/workflows/cli-tests.yaml

@@ -135,7 +135,7 @@ jobs:
         # 1. the oldest supported nix version (which is 2.9.0? But determinate-systems installer has 2.12.0)
         # 2. nix 2.19.2: version before nix profile changes
         # 2. latest nix version (note, 2.20.1 introduced a new profile change)
-        nix-version: ["2.12.0", "2.19.2", "2.20.1"]
+        nix-version: ["2.12.0", "2.19.2", "2.30.2"]
         exclude:
           # Only runs tests on macos if explicitly requested, or on a schedule
           - os: "${{ (inputs.run-mac-tests || github.event.schedule != '') && 'dummy' || 'macos-13' }}"