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trivial-builders/test/references.nix: fix eval
The command
```
nix-build -A tests.trivial-builders.references --show-trace
```
fails eval with
```
in job ‘nixpkgs.tests.trivial-builders.references’:
error: The option `meta.description' does not exist. Definition values:
- In `makeTest parameters': "Run the Nixpkgs trivial builders tests"
```
because `meta.description` and `meta.license` are not valid for
`nixosTest`s (they are valid for `mkDerivation` of course).
This has been causing Hydra eval failures:
https://hydra.nixos.org/jobset/nixos/pr-209870-gcc-external-bootstrap#tabs-errors
Let's fix eval by removing these attributes.