Don't use hyperfine during testing

A new command ./y.rs bench is introduced for benchmarking. This change
allows skipping hyperfine installation in ./y.rs prepare and thus avoids
writing to ~/.cargo/bin.

.github/workflows/main.yml

@@ -62,12 +62,6 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
-    - name: Cache cargo installed crates
-      uses: actions/cache@v3
-      with:
-        path: ~/.cargo/bin
-        key: ${{ runner.os }}-${{ matrix.env.TARGET_TRIPLE }}-cargo-installed-crates
-
     - name: Cache cargo registry and index
       uses: actions/cache@v3
       with:

.github/workflows/nightly-cranelift.yml

@@ -13,12 +13,6 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
-    - name: Cache cargo installed crates
-      uses: actions/cache@v3
-      with:
-        path: ~/.cargo/bin
-        key: ubuntu-latest-cargo-installed-crates
-
     - name: Prepare dependencies
       run: |
         git config --global user.email "user@example.com"

.github/workflows/rustc.yml

@@ -10,12 +10,6 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
-    - name: Cache cargo installed crates
-      uses: actions/cache@v3
-      with:
-        path: ~/.cargo/bin
-        key: ${{ runner.os }}-cargo-installed-crates
-
     - name: Cache cargo registry and index
       uses: actions/cache@v3
       with:
@@ -44,12 +38,6 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
-    - name: Cache cargo installed crates
-      uses: actions/cache@v3
-      with:
-        path: ~/.cargo/bin
-        key: ${{ runner.os }}-cargo-installed-crates
-
     - name: Cache cargo registry and index
       uses: actions/cache@v3
       with: