fix(ci): add missing install Mage step (#8448) (#8462)

(cherry picked from commit 00f81bd)

Co-authored-by: Andrzej Stencel <andrzej.stencel@elastic.co>

Author: mergify[bot]

.github/workflows/bump-otel-version.yml

@@ -29,6 +29,12 @@ jobs:
       with:
         go-version-file: 'go.mod'
 
+    - name: Install mage
+      uses: magefile/mage-action@6f50bbb8ea47d56e62dee92392788acbc8192d0b # v3.1.0
+      with:
+        version: v1.14.0
+        install-only: true
+
     - name: Run Updatecli in Apply mode
       uses: elastic/oblt-actions/updatecli/run@v1
       with: