Update ramsey/composer-install action to v3

Author: renovate[bot]

.github/workflows/subsplit-client.yaml

@@ -17,5 +17,5 @@ jobs:
         with:
           fetch-depth: '0'
           persist-credentials: 'false'
-      - uses: "ramsey/composer-install@v2"
+      - uses: "ramsey/composer-install@3cf229dc2919194e9e36783941438d17239e8520" # 3.1.1
       - run: make generate-example-client-subsplit

.github/workflows/test-client.yaml

@@ -17,7 +17,7 @@ jobs:
         with:
           fetch-depth: '0'
           persist-credentials: 'false'
-      - uses: "ramsey/composer-install@v2"
+      - uses: "ramsey/composer-install@3cf229dc2919194e9e36783941438d17239e8520" # 3.1.1
       - run: make generate-example-client-${{ inputs.name }}
       - name: Tar example files
         run: tar -czf example.tar ./example
@@ -87,7 +87,7 @@ jobs:
           path: ./
       - name: UnTar example files
         run: tar -xzf example.tar
-      - uses: ramsey/composer-install@v2
+      - uses: ramsey/composer-install@3cf229dc2919194e9e36783941438d17239e8520 # 3.1.1
         with:
           working-directory: "example/generated-${{ inputs.name }}/"
           ignore-cache: "yes"