[Fix] Make python API doc generation in Microsoft-hosted Agent (#21766)

### Description
<!-- Describe your changes. -->



### Motivation and Context
1. Python API doc needs to be merged from a fork, but 1ES self-hosted
pool is only for one github repo.
2. ubuntu-latest will be install numpy above 2.0 by default, and current
python API doc generation doesn't support it.
So I pin numpy < 2.0.0

---------

.github/workflows/publish-python-apidocs.yml

@@ -22,7 +22,7 @@ permissions:
 jobs:
   build:
     name: Generate Python API docs
-    runs-on: ["self-hosted", "1ES.Pool=onnxruntime-github-ubuntu-CPU"]
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - name: Install tools

docs/python/requirements.txt

@@ -13,7 +13,7 @@ pandas
 pydot
 coloredlogs
 flatbuffers
-numpy
+numpy<2.0.0
 packaging
 protobuf
 sympy