upgrade deprecated gitlab actions

Author: RCasatta

.github/workflows/fuzz.yml

@@ -51,7 +51,7 @@ roundtrip_confidential,
           echo "Using RUSTFLAGS $RUSTFLAGS"
           cd fuzz && ./fuzz.sh "${{ matrix.fuzz_target }}"
       - run: echo "${{ matrix.fuzz_target }}" >executed_${{ matrix.fuzz_target }}
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           name: executed_${{ matrix.fuzz_target }}
           path: executed_${{ matrix.fuzz_target }}
@@ -62,7 +62,7 @@ roundtrip_confidential,
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4
       - name: Display structure of downloaded files
         run: ls -R
       - run: find executed_* -type f -exec cat {} + | sort > executed

fuzz/generate-files.sh

@@ -82,7 +82,7 @@ $(for name in $(listTargetNames); do echo "$name,"; done)
           echo "Using RUSTFLAGS \$RUSTFLAGS"
           cd fuzz && ./fuzz.sh "\${{ matrix.fuzz_target }}"
       - run: echo "\${{ matrix.fuzz_target }}" >executed_\${{ matrix.fuzz_target }}
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           name: executed_\${{ matrix.fuzz_target }}
           path: executed_\${{ matrix.fuzz_target }}