Use Blacksmith checkout with sticky-disk git mirror in Elixir CI (#6564)

Co-authored-by: Codesmith <codesmith-bot@users.noreply.github.com>

Author: 2 people

.github/workflows/elixir.yml

@@ -50,7 +50,7 @@ jobs:
             --health-timeout 5s
             --health-retries 5
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: useblacksmith/checkout@2d63ce5ba61677748c4e92f6eb578a8694226225 # v1.2.0
         with:
           fetch-depth: 0
           filter: blob:none
@@ -150,7 +150,7 @@ jobs:
         shardIndex: [1, 2]
         shardTotal: [2]
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: useblacksmith/checkout@2d63ce5ba61677748c4e92f6eb578a8694226225 # v1.2.0
         with:
           fetch-depth: 0
           filter: blob:none
@@ -239,7 +239,7 @@ jobs:
     timeout-minutes: 15
     runs-on: blacksmith-4vcpu-ubuntu-2404
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: useblacksmith/checkout@2d63ce5ba61677748c4e92f6eb578a8694226225 # v1.2.0
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: 24.17.0
@@ -265,7 +265,7 @@ jobs:
       MIX_ENV: test
     runs-on: blacksmith-4vcpu-ubuntu-2404
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: useblacksmith/checkout@2d63ce5ba61677748c4e92f6eb578a8694226225 # v1.2.0
         with:
           fetch-depth: 0
           filter: blob:none