Bump androidx.activity:activity from 1.12.2 to 1.12.3 in /15_mvi/mvvm

Bumps androidx.activity:activity from 1.12.2 to 1.12.3.

---
updated-dependencies:
- dependency-name: androidx.activity:activity
  dependency-version: 1.12.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

15_mvi/mvvm/gradle/libs.versions.toml

@@ -7,7 +7,7 @@ junitVersion = "1.3.0"
 espressoCore = "3.7.0"
 appcompat = "1.7.1"
 material = "1.13.0"
-activity = "1.12.2"
+activity = "1.12.3"
 constraintlayout = "2.2.1"
 
 [libraries]