Update workflow versions

Author: simonprev

.github/workflows/ci.yml

@@ -14,22 +14,22 @@ jobs:
       MIX_ENV: test
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
-      - uses: erlef/setup-elixir@v1
+      - uses: erlef/setup-elixir@v2
         with:
           elixir-version: ${{ matrix.elixir-version }}
           otp-version: ${{ matrix.otp-version }}
 
-      - uses: actions/cache@v1
+      - uses: actions/cache@v4
         id: deps-cache
         with:
           path: deps
           key: ${{ runner.os }}-deps-${{ hashFiles(format('{0}/mix.lock', github.workspace)) }}
           restore-keys: |
             ${{ runner.os }}-deps-
 
-      - uses: actions/cache@v1
+      - uses: actions/cache@v4
         id: build-cache
         with:
           path: _build

.github/workflows/publish.yml

@@ -11,7 +11,7 @@ jobs:
     env:
       HEX_API_KEY: ${{ secrets.MIREGO_HEXPM_API_KEY }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: erlef/setup-beam@v1
         with:
           otp-version: 25.x