Merge branch '2.0' into 2.1.

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: monthly

.github/workflows/ci-linux.yml

@@ -9,7 +9,7 @@ jobs:
       CXX: ${{ matrix.compiler }}
       CXXFLAGS: -Werror
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Install dependencies
         run: |
           sudo apt-get update --assume-yes

.github/workflows/ci-windows.yml

@@ -8,10 +8,10 @@ jobs:
   build:
     runs-on: windows-2019
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Setup MSBuild
-        uses: microsoft/setup-msbuild@v1.1.0
+        uses: microsoft/setup-msbuild@v1.3
 
       - name: Run CMake
         run: |