Update Github action workflow

Author: blegat

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
             os: windows-latest
             arch: x64
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.version }}
@@ -37,7 +37,7 @@ jobs:
         env:
           DATADEPS_ALWAYS_ACCEPT: true # For MLDatasets.MNIST
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v1
+      - uses: codecov/codecov-action@v3
         with:
           file: lcov.info
   docs:
@@ -47,7 +47,7 @@ jobs:
       # Fix for Plots with GR backend, see https://github.com/jheinen/GR.jl/issues/422
       GKSwstype: nul
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: julia-actions/setup-julia@v1
         with:
           version: '1'