changed: using Pkg.add instead of pkg strings

Author: franckgaga

.github/workflows/Benchmark.yml

@@ -31,7 +31,7 @@ jobs:
             ${{ runner.os }}-test-
             ${{ runner.os }}-
       - name: Install dependencies
-        run: julia -e 'using Pkg; pkg"add JSON PkgBenchmark [email protected]"'
+        run: julia -e 'using Pkg; Pkg.add["JSON", "PkgBenchmark", "[email protected]"]'
       - name: Run benchmarks
         run: julia benchmark/run_benchmarks.jl
         env: