[update] github-actions

Author: get-me-power

.github/workflows/ci.yml

@@ -15,16 +15,17 @@ jobs:
     strategy:
       matrix:
         vim:
+        - v9.0.0000
         - v8.2.1000
         - v8.2.0000
         - v8.1.0000
         - v8.0.0000
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@main
     - name: Checkout vim-themis
-      uses: actions/checkout@v2
+      uses: actions/checkout@main
       with:
         repository: thinca/vim-themis
         path: vim-themis

.github/workflows/vint.yml

@@ -16,9 +16,9 @@ jobs:
         python-version: [3.8]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@main
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@main
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies