use F instead of f in sprintf

Co-authored-by: John Paul E. Balandan, CPA <paulbalandan@gmail.com>

Author: michalsn

system/Debug/Toolbar.php

@@ -397,7 +397,7 @@ public function prepare(?RequestInterface $request = null, ?ResponseInterface $r
             helper('filesystem');
 
             // Updated to microtime() so we can get history
-            $time = Time::now()->format('U.u');
+            $time = sprintf('%.6F', Time::now()->format('U.u'));
 
             if (! is_dir(WRITEPATH . 'debugbar')) {
                 mkdir(WRITEPATH . 'debugbar', 0777);

system/Debug/Toolbar/Collectors/History.php

@@ -90,7 +90,7 @@ public function setFiles(string $current, int $limit = 20)
             $contents = @json_decode($contents);
             if (json_last_error() === JSON_ERROR_NONE) {
                 preg_match('/debugbar_(.*)\.json$/s', $filename, $time);
-                $time = sprintf('%.6f', $time[1] ?? 0);
+                $time = sprintf('%.6F', $time[1] ?? 0);
 
                 // Debugbar files shown in History Collector
                 $files[] = [