CI: Update to Python 3.6, bump actions versions

Python 3.5 is no longer supported by GitHub Actions. While at it, bump
the "setup-python" and "cache" actions to v2, and simplify the Windows
build to use less third party actions.

Author: aperezdc

.github/workflows/ci.yml

@@ -17,11 +17,11 @@ jobs:
             libegl1-mesa-dev libxml2-dev libxslt1-dev libyaml-dev llvm-dev \
             libclang-dev libglib2.0-dev ninja-build
       - name: Setup Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v2
         with:
-          python-version: 3.5
+          python-version: 3.6
       - name: Python Package Cache
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('.github/workflows/ci.yml') }}
@@ -102,20 +102,26 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Setup Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.6
       - name: Setup MSVC
         uses: seanmiddleditch/gha-setup-vsdevenv@master
-      - name: Install Bison
+      - name: Install Tools
         run: |
-          choco install winflexbison3 -y --no-progress --stop-on-first-failure
-      - name: Build
-        uses: BSFishy/[email protected]
-        with:
-          action: build
-          meson-version: 0.56.0
-          setup-options: >-
-            -Dbuild-docs=false
-            -Dlibxkbcommon:enable-docs=false
-            -Dlibxkbcommon:enable-wayland=false
-            -Dlibxkbcommon:enable-x11=false
-            -Dlibxkbcommon:enable-xkbregistry=false
+          choco install winflexbison3 ninja -y --no-progress --stop-on-first-failure
+      - name: Install Python Packages
+        run: |
+          python -m pip install --upgrade pip setuptools wheel
+          python -m pip install meson==0.56
+      - name: Meson - Configure
+        run: >+
+          meson _build
+          -Dbuild-docs=false
+          -Dlibxkbcommon:enable-docs=false
+          -Dlibxkbcommon:enable-wayland=false
+          -Dlibxkbcommon:enable-x11=false
+          -Dlibxkbcommon:enable-xkbregistry=false
+      - name: Meson - Build
+        run: |
+          ninja -C _build