[StepSecurity] Apply security best practices

.github/workflows/build_and_test.yaml

@@ -31,8 +31,13 @@ jobs:
     name: ${{ matrix.name }}
     runs-on: ${{ matrix.runner }}
     steps:
-    - uses: actions/checkout@v3
-    - uses: Swatinem/rust-cache@v2
+    - name: Harden the runner (Audit all outbound calls)
+      uses: step-security/harden-runner@fa2e9d605c4eeb9fcad4c99c224cee0c6c7f3594 # v2.16.0
+      with:
+        egress-policy: audit
+
+    - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+    - uses: step-security/rust-cache@9be15b830520fab0ec3939586e917e4855cf76bd # v2.8.3
       with:
         # rust-cache already handles all the sane defaults for caching rust builds.
         # However because we are running seperate debug/release builds in parallel,

.github/workflows/license_check.yaml

@@ -20,9 +20,14 @@ jobs:
     runs-on: ubuntu-24.04
     name: License Check
     steps:
-      - uses: actions/checkout@v4
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@fa2e9d605c4eeb9fcad4c99c224cee0c6c7f3594 # v2.16.0
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
       - name: Install cargo deny
-        uses: taiki-e/install-action@v2
+        uses: taiki-e/install-action@bfadeaba214680fb4ab63e710bcb2a6a17019fdc # v2.70.4
         with:
           tool: cargo-deny@0.18.2
       - run: cargo deny check licenses

.github/workflows/release.yaml

@@ -11,7 +11,12 @@ jobs:
     name: "Publish to crates.io"
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v3
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@fa2e9d605c4eeb9fcad4c99c224cee0c6c7f3594 # v2.16.0
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
       - name: Publish
         run: cargo publish
         env: