[MNT] [Dependabot](deps): Update einops requirement from <0.8.0,>=0.6.0 to >=0.6.0,<0.9.0 (#618)

Updates the requirements on
[einops](https://github.com/arogozhnikov/einops) to permit the latest
version.

Author: dependabot[bot]

pyproject.toml

@@ -48,7 +48,7 @@ dependencies = [
     "omegaconf>=2.3.0",
     "torchmetrics>=0.10.0,<1.7.0",
     "pytorch-tabnet==4.1",
-    "einops>=0.6.0,<0.8.0",
+    "einops>=0.6.0,<0.9.0",
     "rich>=11.0.0",
     "scikit-base",
 ]