[TD] Pin numpy to 1.26.0 in indexer (#130442)

Temporarily pin 1.26.0 to get the workflow working while I go sort out which dependencies need to be updated

Succeeding run: https://github.com/pytorch/pytorch/actions/runs/9877733366/job/27280052419?pr=130442

Tested by adding my branch to the trust relationship for the policy and removing the environment
Pull Request resolved: https://github.com/pytorch/pytorch/pull/130442
Approved by: https://github.com/atalman, https://github.com/malfet
diff --git a/.github/scripts/td_llm_indexer.sh b/.github/scripts/td_llm_indexer.sh
index 97565b5..50dd51a 100644
--- a/.github/scripts/td_llm_indexer.sh
+++ b/.github/scripts/td_llm_indexer.sh
@@ -7,6 +7,7 @@
 pip install -q -r requirements.txt
 cd ../codellama
 pip install -e .
+pip install numpy==1.26.0
 
 # Run indexer
 cd ../llm-target-determinator