Move to newer gradle and try to make it build

Removing buildToolsVersion, which gradle 7 ignored. 30.0.2 is required
by AGP 7.0.4. But why was this specificed at all?

app/build.gradle

@@ -17,17 +17,17 @@
 
 buildscript {
     repositories {
-        jcenter()
+        mavenCentral()
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.3'
+        classpath 'com.android.tools.build:gradle:7.0.4'
     }
 }
 apply plugin: 'com.android.application'
 
 repositories {
-    jcenter()
+    mavenCentral()
     google()
 }
 
@@ -54,7 +54,6 @@ allprojects {
 
 android {
     compileSdkVersion 29
-    buildToolsVersion '29.0.3'
 
     defaultConfig {
         minSdkVersion 14

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,7 @@
+#Fri Jan 21 11:46:24 CET 2022
 distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
 distributionPath=wrapper/dists
-distributionSha256Sum=6c4276f97c9059ef4dfb06cc7325c43ed9b933ab04f032e9d9372e8589cb6faf
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.5.1-all.zip
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
+distributionSha256Sum=b586e04868a22fd817c8971330fec37e298f3242eb85c374181b12d637f80302
+zipStoreBase=GRADLE_USER_HOME