Bump elementary flatpak runtime to 7

Author: adithyankv

.github/workflows/CI.yml

@@ -34,7 +34,7 @@ jobs:
 
     # This job runs in a special container designed for building Flatpaks for AppCenter
     container:
-      image: ghcr.io/elementary/flatpak-platform/runtime:6
+      image: ghcr.io/elementary/flatpak-platform/runtime:7
       options: --privileged
 
     steps:

com.github.phoneybadger.picker.yml

@@ -1,7 +1,7 @@
 app-id: com.github.phoneybadger.picker
 
 runtime: io.elementary.Platform
-runtime-version: '6.1'
+runtime-version: '7'
 sdk: io.elementary.Sdk
 
 command: com.github.phoneybadger.picker