Swith to master branch before proceeding.

src/scripts/sync_with_openfisca_france.ts

@@ -17,6 +17,7 @@ interface Project {
 /// Upgrade, test & push openfisca-france-reforms when openfisca-france or
 /// openfisca-france-reforms change.
 async function main() {
+  await $`git switch master`
   await $`poetry update`
   await $`poetry install`
   await $`poetry run python -m openfisca_france_reforms.plf_2022.scripts.run_test`