[MNT]: create build-requirements.txt and update dev-requirements.txt

.circleci/config.yml

@@ -103,7 +103,7 @@ commands:
       - run:
           name: Install Python dependencies
           command: |
-            python -m pip install --user meson-python numpy pybind11 setuptools-scm
+            python -m pip install --user -r requirements/dev/build-requirements.txt
             python -m pip install --user \
                 numpy<< parameters.numpy_version >> \
                 -r requirements/doc/doc-requirements.txt

azure-pipelines.yml

@@ -135,7 +135,7 @@ stages:
 
           - bash: |
               python -m pip install --upgrade pip
-              python -m pip install --upgrade meson-python numpy pybind11 setuptools-scm
+              python -m pip install --upgrade -r requirements/dev/build-requirements.txt
               python -m pip install -r requirements/testing/all.txt -r requirements/testing/extra.txt
             displayName: 'Install dependencies with pip'
 

requirements/dev/build-requirements.txt

@@ -0,0 +1,4 @@
+pybind11
+meson-python
+numpy
+setuptools-scm

requirements/dev/dev-requirements.txt

@@ -1,3 +1,4 @@
+-r build-requirements.txt
 -r ../doc/doc-requirements.txt
 -r ../testing/all.txt
 -r ../testing/extra.txt