Bump org.osmdroid:osmdroid-android from 6.1.18 to 6.1.20

Bumps [org.osmdroid:osmdroid-android](https://github.com/osmdroid/osmdroid) from 6.1.18 to 6.1.20.
- [Release notes](https://github.com/osmdroid/osmdroid/releases)
- [Changelog](https://github.com/osmdroid/osmdroid/blob/master/CHANGELOG.md)
- [Commits](osmdroid/osmdroid@osmdroid-parent-6.1.18...osmdroid-parent-6.1.20)

---
updated-dependencies:
- dependency-name: org.osmdroid:osmdroid-android
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

app/build.gradle

@@ -173,7 +173,7 @@ dependencies {
     implementation("com.googlecode.jcsv:jcsv:1.4.0")
     implementation('com.google.maps.android:android-maps-utils:3.8.2')
 
-    implementation('org.osmdroid:osmdroid-android:6.1.18')
+    implementation('org.osmdroid:osmdroid-android:6.1.20')
     implementation("com.github.MKergall:osmbonuspack:6.9.0")
     implementation("com.google.android.material:material:1.12.0")
     implementation("androidx.legacy:legacy-support-v13:1.0.0")