Bump io from 7.1.13 to 7.2.1 (#271)

Bumps io from 7.1.13 to 7.2.1.

---
updated-dependencies:
- dependency-name: com.itextpdf:io
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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app/build.gradle

@@ -60,7 +60,7 @@ dependencies {
  implementation 'com.github.ctodobom:FabToolbar:3c5f0e0ff1b6d5089e20b7da7157a604075ae943'
  implementation 'org.matomo.sdk:tracker:4.1.2'
  implementation 'com.github.MikeOrtiz:TouchImageView:3.1.1'
- implementation 'com.itextpdf:kernel:7.1.13'
+ implementation 'com.itextpdf:kernel:7.2.1'
  implementation 'com.itextpdf:layout:7.2.1'
  implementation 'com.itextpdf:io:7.1.13'
 }