release: cut v1.1.0 — event delete (write foundation)

Version bumped to 1.1.0 / 8. No code changes beyond the version — 1.1.0 is
the write-foundation slice: WRITE_CALENDAR, read-only-calendar detection,
and event delete (whole series or single occurrence). CHANGELOG [1.1.0]
carries the details; ROADMAP/STATE mark slice v1.1 shipped.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/build.gradle.kts

@@ -23,8 +23,8 @@ android {
         applicationId = "de.jeanlucmakiola.calendula"
         minSdk = 29
         targetSdk = 36
-        versionCode = 7
-        versionName = "1.0.0"
+        versionCode = 8
+        versionName = "1.1.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }