Use for instead of forEach with ranges (#1035)

* Use `for` instead of `forEach` with ranges.

`forEach` is several times slower when used with ranges.

* Add changelog

Author: jmartinesp

changelog.d/1035.bugfix

@@ -0,0 +1 @@
+Use `for` instead of `forEach` in `DefaultDiffCacheInvalidator` to improve performance.

libraries/androidutils/src/main/kotlin/io/element/android/libraries/androidutils/diff/DiffCacheInvalidator.kt

@@ -38,9 +38,9 @@ interface DiffCacheInvalidator<T> {
 class DefaultDiffCacheInvalidator<T> : DiffCacheInvalidator<T> {
 
     override fun onChanged(position: Int, count: Int, cache: MutableDiffCache<T>) {
-        (position until position + count).forEach {
+        for (i in position until position + count) {
             // Invalidate cache
-            cache[it] = null
+            cache[i] = null
         }
     }