When a new Tor Browser version doesn't include any new firefox-android commit, its versionCode number will not change, although `MOZ_BUILD_DATE` is changing. The reason is that the function `generateFennecVersionCode` in `fenix/buildSrc/src/main/java/Config.kt` is taking the date from `MOZ_BUILD_DATE` and using the number of hours from December 28, 2014, to generate a versionCode. However, `MOZ_BUILD_DATE` is based on the commit date, on which we add the Tor Browser version as seconds, so when a new version doesn't change the `firefox-android`, `MOZ_BUILD_DATE` will only be change by a few seconds, which is not enough to make `generateFennecVersionCode` update the versionCode. To fix this we can add an empty firefox-android commit as a quick workaround for this release, before finding a better way to handle changing `MOZ_BUILD_DATE` for new releases.