chore: upgrade version of Node.js to 16

Author: everythingfunctional

.github/workflows/test-workflow.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: fpm-setup
         uses: ./ # Uses action in the root directory

README.md

@@ -9,7 +9,7 @@ __GitHub Action to setup the [Fortran Package Manager](https://github.com/fortra
 ## Usage
 
 ```yaml
-  - uses: fortran-lang/setup-fpm@v4
+  - uses: fortran-lang/setup-fpm@v5
     with:
       github-token: ${{ secrets.GITHUB_TOKEN }}
 ```

action.yml

@@ -17,5 +17,5 @@ inputs:
     required: false
     default: 'https://github.com/fortran-lang/fpm'
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'index.js'