Merge branch '5.0' into 5.1

* 5.0:
  Handle fetch mode deprecation of DBAL 2.11.
  Fixed handling of CSRF logout error
  [WebProfilerBundle] changed label of memory usage in time panel (Mb into MiB)
  [DotEnv][WebLink][Templating][ErrorHandler] Updated README with minimal example

Author: nicolas-grekas

Resources/views/Collector/time.js

@@ -94,7 +94,7 @@ class TimelineEngine {
 
     createLabel(name, duration, memory, period) {
         const label = this.renderer.createText(name, period.start * this.scale, this.labelY, 'timeline-label');
-        const sublabel = this.renderer.createTspan(`  ${duration} ms / ${memory} Mb`, 'timeline-sublabel');
+        const sublabel = this.renderer.createTspan(`  ${duration} ms / ${memory} MiB`, 'timeline-sublabel');
 
         label.appendChild(sublabel);