Update CI actions to their latest versions

* checkout (v3)
* setup-java (v3)
* cache (v3)
* upload-artifact (v3)
* setup-python (v4)

.github/workflows/cont_integration.yml

@@ -19,13 +19,13 @@ jobs:
           - version: 1.61.0 # MSRV
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Generate cache key
         run: echo "${{ matrix.rust.version }} ${{ matrix.features }}" | tee .cache_key
 
       - name: Cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: |
             ~/.cargo/registry
@@ -61,7 +61,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set default toolchain
         run: rustup default nightly