Bump exoplayerVersion from 2.18.0 to 2.18.1

Bumps `exoplayerVersion` from 2.18.0 to 2.18.1.

Updates `exoplayer` from 2.18.0 to 2.18.1
- [Release notes](https://github.com/google/ExoPlayer/releases)
- [Changelog](https://github.com/google/ExoPlayer/blob/release-v2/RELEASENOTES.md)
- [Commits](https://github.com/google/ExoPlayer/compare/r2.18.0...r2.18.1)

Updates `extension-okhttp` from 2.18.0 to 2.18.1
- [Release notes](https://github.com/google/ExoPlayer/releases)
- [Changelog](https://github.com/google/ExoPlayer/blob/release-v2/RELEASENOTES.md)
- [Commits](https://github.com/google/ExoPlayer/compare/r2.18.0...r2.18.1)

---
updated-dependencies:
- dependency-name: com.google.android.exoplayer:exoplayer
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.google.android.exoplayer:extension-okhttp
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -14,7 +14,7 @@ buildscript {
         workRuntime = "2.7.1"
         fidoVersion = "4.1.0"
         checkerVersion = "3.21.2"
-        exoplayerVersion = "2.18.0"
+        exoplayerVersion = "2.18.1"
         documentScannerVersion = "1.0.1"
 
         ciBuild = System.getenv("CI") == "true"