build(deps): bump com.android.tools:r8 from 8.5.35 to 8.7.18

Bumps com.android.tools:r8 from 8.5.35 to 8.7.18.

---
updated-dependencies:
- dependency-name: com.android.tools:r8
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -6,7 +6,7 @@ commons_lang3 = "3.17.0"
 commons_text = "1.13.0"
 guava = "33.4.0-jre"
 junit = "4.13.2"
-r8 = "8.5.35"
+r8 = "8.7.18"
 smali = "3.0.9"
 xmlpull = "1.1.3.1"
 xmlunit = "2.10.0"