Revert "feat: Use jammy repositories for mongo installation."

This reverts commit a245dec.

Author: dianakhuang

.github/workflows/unit-tests.yml

@@ -94,7 +94,7 @@ jobs:
         run: |
           if [[ "${{ matrix.mongo-version }}" != "4.4" ]]; then
             wget -qO - https://www.mongodb.org/static/pgp/server-${{ matrix.mongo-version }}.asc | sudo apt-key add -
-            echo "deb https://repo.mongodb.org/apt/ubuntu jammy/mongodb-org/${{ matrix.mongo-version }} multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-${{ matrix.mongo-version }}.list
+            echo "deb https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/${{ matrix.mongo-version }} multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-${{ matrix.mongo-version }}.list
             sudo apt-get update && sudo apt-get install -y mongodb-org="${{ matrix.mongo-version }}.*"
           fi