Remove dev installation of VCPKG (pybamm-team#4633)

* Remove dev branch install

* Temporarily make it build on PRs

* Disable building on PRs again

.github/workflows/publish_pypi.yml

@@ -51,14 +51,6 @@ jobs:
       - name: Clone pybind11 repo (no history)
         run: git clone --depth 1 --branch v2.12.0 https://github.com/pybind/pybind11.git -c advice.detachedHead=false
 
-      - name: Install vcpkg on Windows
-        run: |
-          cd C:\
-          rm -r -fo 'C:\vcpkg'
-          git clone https://github.com/microsoft/vcpkg
-          cd vcpkg
-          .\bootstrap-vcpkg.bat
-
       - name: Cache packages installed through vcpkg on Windows
         uses: actions/cache@v4
         env: