Update Rust version in CI workflow to 1.71.0

Author: Lokathor

.github/workflows/rust.yml

@@ -19,7 +19,7 @@ jobs:
         include:
         # versions (all on linux-x86_64)
         - { rust: 1.34.0, os: ubuntu-latest }
-        - { rust: 1.68.0, os: ubuntu-latest }
+        - { rust: 1.71.0, os: ubuntu-latest }
         - { rust: stable, os: ubuntu-latest }
         - { rust: beta, os: ubuntu-latest }
         - { rust: nightly, os: ubuntu-latest }
@@ -38,7 +38,7 @@ jobs:
     - run: cargo test --verbose --no-default-features
     - run: cargo test --verbose
     - run: cargo test --verbose --features derive
-      if: matrix.rust == '1.68.0'
+      if: matrix.rust == '1.71.0'
     - run: cargo test --verbose --all-features
       if: matrix.rust == 'nightly'
     - run: cargo test --verbose --manifest-path=derive/Cargo.toml --all-features