Move update bb ci job to its own file

.github/workflows/update-babashka.yml

@@ -0,0 +1,29 @@
+name: "Update deps"
+on:
+  workflow_dispatch: # allows manual triggering
+  schedule:
+    - cron: "39 3 * * 1"
+
+jobs:
+  clojure-deps:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+
+      - name: Update babashka version
+        run: "nix run .#babashka-unwrapped.updateScript"
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v7
+        with:
+          commit-message: Update
+          title: Update clojure dependencies
+          assignees: jlesquembre
+          branch: update-babahska
+          labels: |
+            dependencies
+            automated

.github/workflows/update-deps.yml

@@ -23,9 +23,6 @@ jobs:
       - name: Update clojure lock files
         run: "nix develop --command update-deps"
 
-      - name: Update babashka
-        run: "nix run .#babashka-unwrapped.updateScript"
-
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v7
         with: