Bump material from 1.4.0 to 1.6.0 (#434)

Bumps [material](https://github.com/material-components/material-components-android) from 1.4.0 to 1.6.0.
- [Release notes](https://github.com/material-components/material-components-android/releases)
- [Commits](https://github.com/material-components/material-components-android/compare/1.4.0...1.6.0)

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

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buildsystem/dependencies.gradle

@@ -32,7 +32,7 @@ ext.versions = [
         kotlinSerialization         : '1.3.2',
         leakcanary                  : '2.8.1',
         lifecycle                   : '2.2.0',
-        material                    : '1.4.0',
+        material                    : '1.6.0',
         navigation                  : '2.3.5',
         okHttp                      : '4.9.3',
         okio                        : '3.0.0',