build: align minimum build dependencies with ndn-cxx

* gcc 7.4
 * clang 6.0
 * Xcode 10.0 (11.3 or later recommended)

Change-Id: Ie867798d37898dbabb0620de719fff4bd46df590

.github/workflows/ci.yml

@@ -22,8 +22,6 @@ jobs:
         include:
           - compiler: g++-7
             os: ubuntu-18.04
-          - compiler: clang++-5.0
-            os: ubuntu-18.04
           - compiler: clang++-6.0
             os: ubuntu-18.04
     runs-on: ${{ matrix.os }}
@@ -37,7 +35,7 @@ jobs:
           sudo apt-get -qy install ${CXX/clang++/clang}
           ${CXX} --version
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Build and test
         run: ./.jenkins
 
@@ -51,7 +49,7 @@ jobs:
         include:
           - xcode: '12.5'
             os: macos-11
-          - xcode: '13'
+          - xcode: '13.2'
             os: macos-11
     runs-on: ${{ matrix.os }}
     env:
@@ -63,6 +61,6 @@ jobs:
         with:
           xcode-version: ${{ matrix.xcode }}
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Build and test
         run: ./.jenkins

.github/workflows/docs.yml

@@ -21,7 +21,7 @@ jobs:
       WAF_JOBS: 3
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Install dependencies
         run: |
           case ${RUNNER_OS} in