Require Rust 1.41 (was 1.40)

This is required for Result::map_or_else.

Additionally, run clippy with 1.41 as well. Otherwise it reports
suggestions that are not compatible with 1.41.

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       matrix:
         platform: [ubuntu-latest, macos-latest, windows-latest]
-        rust: [1.40.0, stable]
+        rust: [1.41.1, stable]
     runs-on: ${{ matrix.platform }}
     steps:
       - uses: actions/checkout@v2
@@ -45,7 +45,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-            toolchain: 1.46.0
+            toolchain: 1.41.1
             components: clippy
             override: true
       - uses: actions-rs/clippy-check@v1