fix(ci): enable corepack sooner

CI was failing, probably because of a change in the setup-node action:
https://github.com/gilbsgilbs/babel-plugin-i18next-extract/actions/runs/7363053375/job/20042120587?pr=264

Enabling corepack before starting the action should fix the issue. See
actions/setup-node#480 (comment)

.github/workflows/main.yml

@@ -12,12 +12,12 @@ jobs:
     name: Run static checks
     steps:
       - uses: actions/checkout@v4
+      - run: corepack enable
       - name: Setup node
         uses: actions/setup-node@v4
         with:
           node-version: ${{ env.MAIN_NODE_VERSION }}
           cache: 'yarn'
-      - run: corepack enable
       - run: yarn install
       - run: yarn run lint
       - run: yarn run types
@@ -30,12 +30,12 @@ jobs:
         node: ["18", "20", "21"]
     steps:
       - uses: actions/checkout@v4
+      - run: corepack enable
       - name: Setup node
         uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node }}
           cache: 'yarn'
-      - run: corepack enable
       - name: Install dependencies
         run: yarn install
       - name: Run tests
@@ -49,11 +49,11 @@ jobs:
     name: Build
     steps:
       - uses: actions/checkout@v4
+      - run: corepack enable
       - name: Setup node
         uses: actions/setup-node@v4
         with:
           node-version: ${{ env.MAIN_NODE_VERSION }}
-      - run: corepack enable
       - run: yarn install
       - run: yarn run build
       - uses: actions/upload-artifact@v3