Specify requests dependency in hook

I am not sure exactly why this change is needed now. I think Hatch
[added support for specifying custom build hook dependencies][oops]
directly in the custom build hook in the last release, and this
might have accidentally broken the way in which we used to specify
this dependency.

It might also be that the breakage is intentional, in which case
they [forgot to update the docs][whoopsie]

[oops]: pypa/hatch@c04877c
[whoopsie]: https://hatch.pypa.io/1.9/config/build/#dependencies_1

pyproject.toml

@@ -1,5 +1,8 @@
 [build-system]
-requires = ["hatchling"]
+requires = [
+  "hatchling",
+  "requests"
+]
 build-backend = "hatchling.build"
 
 [project]
@@ -144,7 +147,6 @@ for = "_APPSIGNAL_BUILD_TRIPLE=\"{args}\" hatch build -t wheel"
 
 [tool.hatch.build.targets.wheel.hooks.custom]
 path = "src/scripts/build_hook.py"
-dependencies = ["requests"]
 
 [tool.hatch.build.targets.sdist.hooks.custom]
 path = "src/scripts/sdist_hook.py"

src/scripts/build_hook.py

@@ -10,7 +10,6 @@
 from runpy import run_path
 from typing import Any
 
-import requests
 from hatchling.builders.hooks.plugin.interface import BuildHookInterface
 
 
@@ -79,7 +78,12 @@ class DownloadError(Exception):
 
 
 class CustomBuildHook(BuildHookInterface):
+    def dependencies(self) -> list[str]:
+        return ["requests"]
+
     def initialize(self, _version: str, build_data: dict[str, Any]) -> None:
+        import requests
+
         """
         This occurs immediately before each build.