Pin dependencies

Author: renovate[bot]

.github/workflows/ci.yml

@@ -9,9 +9,9 @@ jobs:
   ci:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
 
-      - uses: erlef/setup-beam@v1
+      - uses: erlef/setup-beam@b9c58b0450cd832ccdb3c17cc156a47065d2114f # v1
         with:
           otp-version: '26.2.1'
           elixir-version: '1.16.0'