Update `plot-benchmarks` to use `Pico v2`.

Test: Tested locally
Change-Id: I25987f0680c4bc8a04eb58ba0af29b1aac8abd57
diff --git a/development/plot-benchmarks/index.html b/development/plot-benchmarks/index.html
index 0e19900..ca577dc 100644
--- a/development/plot-benchmarks/index.html
+++ b/development/plot-benchmarks/index.html
@@ -5,7 +5,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Plot Benchmarks</title>
-  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@picocss/pico@1/css/pico.min.css">
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@picocss/pico@2/css/pico.min.css">
 </head>
 
 <body>