Fix workflows file, pin mac os FIPS crossbuild runner to macos-13

The macos-13 runner uses intel chips and thus x86, so clang 12.0.0 is
easily available.

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
     name: rustfmt
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Install Rust
         run: rustup update stable && rustup default stable
       - name: Check formatting
@@ -27,7 +27,7 @@ jobs:
     name: clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           submodules: 'recursive'
       - name: Install Rust
@@ -184,7 +184,7 @@ jobs:
           extra_test_args: --workspace --exclude tokio-boring --exclude hyper-boring
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         submodules: 'recursive'
     - name: Install Rust (rustup)
@@ -238,7 +238,7 @@ jobs:
     name: Test FIPS integration
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         submodules: 'recursive'
     - name: Install Rust (rustup)
@@ -250,7 +250,6 @@ jobs:
         version: "12.0.0"
         directory: ${{ runner.temp }}/llvm
     - name: Install golang
-      uses: actions/checkout@v4
       uses: actions/setup-go@v5
       with:
         go-version: '>=1.22.0'
@@ -280,7 +279,7 @@ jobs:
         include:
           - target: x86_64-unknown-linux-gnu
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         submodules: 'recursive'
     - name: Install Rust (rustup)
@@ -298,18 +297,22 @@ jobs:
 
   cross-build-fips:
     name: Cross build from macOS to Linux (FIPS)
-    runs-on: macos-latest
+    runs-on: macos-13 # Need an Intel (x86_64) runner for Clang 12.0.0
     strategy:
       matrix:
         include:
           - target: x86_64-unknown-linux-gnu
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         submodules: 'recursive'
     - name: Install Rust (rustup)
       run: rustup update stable --no-self-update && rustup default stable && rustup target add ${{ matrix.target }}
       shell: bash
+    - name: Install golang
+      uses: actions/setup-go@v5
+      with:
+        go-version: '>=1.22.0'
     - name: Install Clang-12
       uses: KyleMayes/install-llvm-action@v1
       with:
@@ -335,7 +338,7 @@ jobs:
     name: Test features
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         submodules: 'recursive'
     - name: Install Rust (rustup)