Remove unnecessary --workspace flags in CI commands.

The top-level `Cargo.toml` specifies a virtual workspace (one
without a `[package]` section). This means the `--workspace` flag is
unnecessary (unless `--exclude` is specified), because Cargo commands
will process all crates by default. See
https://doc.rust-lang.org/cargo/reference/workspaces.html#virtual-workspace.

Author: nnethercote

.github/workflows/ci_linux.yml

@@ -85,16 +85,16 @@ jobs:
         run: cargo build --all-features -p cust_raw
 
       - name: Build workspace
-        run: cargo build --workspace
+        run: cargo build
 
       - name: Clippy
         env:
           RUSTFLAGS: -Dwarnings
-        run: cargo clippy --workspace
+        run: cargo clippy
 
       # Don't currently test because many tests rely on the system having a CUDA GPU
       # - name: Test
-      #   run: cargo test --workspace
+      #   run: cargo test
 
       - name: Check documentation
         env:

.github/workflows/ci_windows.yml

@@ -98,7 +98,7 @@ jobs:
 
       # Don't currently test because many tests rely on the system having a CUDA GPU
       # - name: Test
-      #   run: cargo test --workspace
+      #   run: cargo test
 
       - name: Check documentation
         env: