patch: CI - bump mongo single kernel workflow - wait for poetry to find the newly released lib version (#236)

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Even if the we cant fetch the library from PYPI, poetry does not seem
up-to-date inmmediately
We try polling poetry until it finds it: 
interval: 1 minute
timeout: 30 minutes

Test using workflow dispatch of a version that does not exist:
<img width="777" height="257" alt="image"
src="https://github.com/user-attachments/assets/183bc630-c347-4aa6-8948-8eee31d56f07"
/>

Test using workflow dispatch of a version that exists:
<img width="545" height="777" alt="image"
src="https://github.com/user-attachments/assets/4c5d8cc8-38ac-4cdc-b802-f8bfc2e98ff8"
/>



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Author: patriciareinoso

.github/workflows/bump_dependent_charms.yaml

@@ -103,8 +103,22 @@ jobs:
         run: |
           poetry remove "${DEP_NAME}"
           VERSION_NUMBER="${VERSION#v}"
-          poetry add "${DEP_NAME}"=="${VERSION_NUMBER}" --group main
-          poetry add "${DEP_NAME}"=="${VERSION_NUMBER}" --group integration
+
+          for i in {1..30}; do
+            echo "Attempt $i: adding ${DEP_NAME}==${VERSION_NUMBER}"
+
+            if poetry add "${DEP_NAME}==${VERSION_NUMBER}" --group main && \
+               poetry add "${DEP_NAME}==${VERSION_NUMBER}" --group integration; then
+              echo "Dependency added successfully"
+              exit 0
+            fi
+
+            echo "Not resolvable yet, sleeping..."
+            sleep 60
+          done
+
+          echo "Poetry could not resolve ${DEP_NAME}==${VERSION_NUMBER}"
+          exit 1
 
       - name: Poetry update
         run: poetry update "${DEP_NAME}"