Skip `BloomEmbeddingTest.test_embeddings` for PT < 1.10
# What does this PR do?

The test `BloomEmbeddingTest.test_embeddings` will load a pretrained-model in `bfloat16`. For PyTorch < 1.10, we have
```bash
RuntimeError: "LayerNormKernelImpl" not implemented for 'BFloat16'
```
so let's skip it to keep Past CI clean 
_The documentation is not available anymore as the PR was closed or merged._<|||||>@LysandreJik For this case, it is specific to test (checkpoint is `bigscience/bigscience-small-testing` which has `bfloat16` in the config file).
