ci: Drop some extraneous setup-python invocations

The prek action bundles in everything it needs, and all the linters
should be installed in venvs with uv or similar, so there's no need to
setup Python as well.

Since 2.19.1, cibuildwheel no longer needed setup-python for building
Pyodide wheels, so we can drop that as well. It also appears to be
causing some kind of conflict during the build [1].

[1] pypa/cibuildwheel#2566

Author: QuLogic

.github/workflows/linting.yml

@@ -15,9 +15,6 @@ jobs:
         with:
           fetch-depth: 0
           persist-credentials: false
-      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97  # v7.0.0
-        with:
-          python-version: "3.x"
       - uses: j178/prek-action@5337cb91e0fa35a7ff31b9ca345126d8bbbcdf16  # v2.0.6
         with:
           extra-args: --hook-stage manual --all-files

.github/workflows/wasm.yml

@@ -44,11 +44,6 @@ jobs:
           fetch-depth: 0
           persist-credentials: false
 
-      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97  # v7.0.0
-        name: Install Python
-        with:
-          python-version: '3.13'
-
       - name: Build wheels for wasm
         uses: pypa/cibuildwheel@4726cd35bb13f7bde50cf2761f2499ac7b3aa32c  # v4.1.1
         env: