Hash pin workflows and config dependabot (#5412)

* Step Security: hash pin and dependabot

Signed-off-by: Joyce Brum <joycebrum@google.com>

* add license to dependabot.yml

Signed-off-by: Joyce <joycebrum@google.com>

---------

Signed-off-by: Joyce Brum <joycebrum@google.com>
Signed-off-by: Joyce <joycebrum@google.com>

.github/dependabot.yml

@@ -0,0 +1,25 @@
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily
+    groups:
+      github-actions:
+        patterns:
+          - "*"
+    open-pull-requests-limit: 3

.github/workflows/autoroll.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
 
       # Checkout the depot tools they are needed by roll_deps.sh
       - name: Checkout depot tools

.github/workflows/bazel.yml

@@ -18,13 +18,13 @@ jobs:
     runs-on: ${{matrix.os}}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           fetch-depth: '0'
       - name: Download dependencies
         run: python3 utils/git-sync-deps
       - name: Mount Bazel cache
-        uses: actions/cache@v3
+        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3.3.2
         with:
           path: ~/.bazel/cache
           key: bazel-cache-${{ runner.os }}

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
   prepare-release-job:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
       - name: Prepare CHANGELOG for version
         run: |
           python utils/generate_changelog.py CHANGES "${{ github.ref_name }}" VERSION_CHANGELOG

.github/workflows/wasm.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
         with:
           fetch-depth: '0'
       - name: Build web