chore: Remove unused psutil dependency (#844)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: aaronsteers

poetry.lock

@@ -47,7 +47,6 @@ jsonschema = ">=4.17.3,<5.0"
 packaging = "*"  # Transitive dependency used directly in code
 referencing = ">=0.36.2"
 pandas = "2.2.3"
-psutil = "6.1.0" # TODO: Remove if unused
 pydantic = "^2.7"
 pyrate-limiter = "~3.1.0"
 python-dateutil = "^2.9.0"
@@ -249,7 +248,6 @@ DEP002 = [
 
   # TODO: Remove these dependencies if not needed:
   "avro",  # Only imported in `unit_tests` code
-  "psutil",
   "rapidfuzz",
   "cohere",
   "markdown",