fix: pin opentelemetry-sdk==1.40.0 to match opentelemetry-api

opentelemetry-sdk 1.41.1 strictly requires opentelemetry-api==1.41.1,
but pyproject.toml pins opentelemetry-api at 1.40.0. The mismatch was
introduced from the dependabotchanges branch during Phase 2 down-merge
and broke pip resolution in CI build (3.11).

Aligns with dev branch and uv.lock (both at 1.40.0).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Ayaz-Microsoft

src/ContentProcessorAPI/requirements.txt

@@ -58,4 +58,4 @@ uvicorn==0.46.0
 watchfiles==1.1.1
 websockets==16.0
 opentelemetry-api==1.40.0
-opentelemetry-sdk==1.41.1
+opentelemetry-sdk==1.40.0