[actions] update sandpaper workflow to version 0.13.0 (#582)

Co-authored-by: zkamvar <zkamvar@users.noreply.github.com>

Author: carpentries-bot

.github/workflows/README.md

@@ -96,7 +96,7 @@ are okay.
 
 This update is run ~~weekly or~~ on demand.
 
-### 03 Maintain: Update Pacakge Cache (update-cache.yaml)
+### 03 Maintain: Update Package Cache (update-cache.yaml)
 
 For lessons that have generated content, we use {renv} to ensure that the output
 is stable. This is controlled by a single lockfile which documents the packages

.github/workflows/sandpaper-version.txt

@@ -1 +1 @@
-0.11.16
+0.13.0