use yq instead of sed

Author: FrenchGithubUser

.github/workflows/famedly-tests.yml

@@ -400,10 +400,12 @@ jobs:
       - name: Update dependency to the current branch
         working-directory: synapse-invite-checker
         run: |
-          sed -i 's|matrix-synapse @ git+.*|matrix-synapse @ git+https://github.com/${{ steps.synapse-ref.outputs.repo }}.git@${{ steps.synapse-ref.outputs.ref }}|' pyproject.toml
+          yq -i -p toml -o toml \
+            '(.tool.hatch.envs.default.dependencies[] | select(test("^matrix-synapse"))) = "matrix-synapse @ git+https://github.com/${{ steps.synapse-ref.outputs.repo }}.git@${{ steps.synapse-ref.outputs.ref }}"' \
+            pyproject.toml
           # Check if the file was actually modified
           if git diff --exit-code pyproject.toml > /dev/null; then
-            echo "::error::The sed command did not modify pyproject.toml. Check if the 'matrix-synapse' dependency exists in the file."
+            echo "::error::The yq command did not modify pyproject.toml. Check if the 'matrix-synapse' dependency exists in tool.hatch.envs.default.dependencies."
             exit 1
           fi