Set seed at the start of the ggplot2 episode

This ensures we don't get unnecessary diffs when doing the monthly package update.

It is fine to have this in an included = FALSE chunk as we don't mind learners getting a different output. The only goal is facilitating infrastructure maintenance.

Author: Bisaloo

episodes/visualizing-ggplot.Rmd

@@ -27,6 +27,7 @@ exercises: 4
 
 ```{r setup, include=FALSE}
 knitr::opts_chunk$set(dpi = 200, out.height = 600, out.width = 600, R.options = list(max.print = 100))
+set.seed(20251007)
 ```
 
 We are going to be using **functions** from the **`ggplot2`** package to create visualizations of data. Functions are predefined bits of code that automate more complicated actions. R itself has many built-in functions, but we can access many more by loading other **packages** of functions and data into R.