Bump version in prep for release.

backend/src/core/main.ts

@@ -37,7 +37,7 @@ export function prepareResponseForStorage(response: FrontendResponseModelT, coun
     timestamp: new Date() // for security, don't trust browser clock, as it may be wrong or fraudulent
       .toISOString()
       .replace(/:..\..*/, ':00.000Z'), // to preserve privacy, intentionally reduce precision of the timestamp
-    app_version: 'v1.1', // TODO: This should be set by the deploy process, not hard-coded!
+    app_version: 'v1.2', // TODO: This should be set by the deploy process, not hard-coded!
     country_code: countryCode,
     postal_code: mapPostalCode(response).postal_code, // to protect the privacy of participants from very small postal code areas, they are merged into larger ones, based on known population data
     duration: response.duration === null ? null : parseInt(response.duration),