constrain numpy<2 and remove unsupported python versions in github workflow

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
     - uses: actions/checkout@v4

pyproject.toml

@@ -13,7 +13,7 @@ readme = "README.md"
 license = {text = "MIT"}
 requires-python = ">=3.7"
 dependencies = [
-  "numpy",
+  "numpy<2",
 ]
 classifiers = [
     "Development Status :: 5 - Production/Stable",