feat: add pyodide_315 support (#2958)

* Add pyodide_315 support

Guarded by cpython_prerelease for the moment.

* Update

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update constraints to pyodide-build 0.39.0

* Update to 315.0.0a2

* Remove example versions

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

unit_test/build_selector_test.py

@@ -91,17 +91,6 @@ def test_build_filter_pypy_all() -> None:
     assert build_selector("pp39-manylinux_x86_64")
 
 
-# Re-enable when we have Pyodide 3.15 prerelease builds to test against
-# def test_build_filter_pyodide_prerelease() -> None:
-#     build_selector = BuildSelector(
-#         build_config="*",
-#         skip_config="",
-#         enable=frozenset([EnableGroup.PyodidePrerelease]),
-#     )
-#     assert build_selector("cp314-pyodide_wasm32")
-#     assert build_selector("cp315-pyodide_wasm32")
-
-
 def test_build_filter_pyodide() -> None:
     build_selector = BuildSelector(
         build_config="*",
@@ -111,6 +100,7 @@ def test_build_filter_pyodide() -> None:
     assert build_selector("cp313-pyodide_wasm32")
     assert build_selector("cp314-pyodide_wasm32")
     assert not build_selector("cp312-pyodide_wasm32")
+    assert not build_selector("cp315-pyodide_wasm32")
 
 
 def test_build_filter_pyodide_eol() -> None:
@@ -122,6 +112,7 @@ def test_build_filter_pyodide_eol() -> None:
     assert build_selector("cp312-pyodide_wasm32")
     assert build_selector("cp313-pyodide_wasm32")
     assert build_selector("cp314-pyodide_wasm32")
+    assert not build_selector("cp315-pyodide_wasm32")
 
 
 def test_skip() -> None: