also increase Rust version in tests

Author: Johann150

.github/workflows/ci.yml

@@ -57,7 +57,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        rust: ["1.40.0", "stable", "beta", "nightly"]
+        rust: ["1.46.0", "stable", "beta", "nightly"]
     name: Test Suite (${{ matrix.rust }})
     steps:
       - uses: actions/checkout@v2