fix(ci): provide Go 1.26.2 toolchain for Renovate dependency lookups

.github/workflows/renovate.yml

@@ -14,6 +14,9 @@ permissions:
   pull-requests: write
   issues: write
 
+env:
+  GO_VERSION: '1.26.2'
+
 jobs:
   renovate:
     runs-on: ubuntu-latest
@@ -24,6 +27,11 @@ jobs:
         with:
           fetch-depth: 1
 
+      - name: Set up Go
+        uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
       - name: Run Renovate
         uses: renovatebot/github-action@b67590ea780158ccd13192c22a3655a5231f869d # v46.1.8
         with: