CompatHelper: add new compat entry for "Fontconfig" at version "0.4" (#39)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: chriselrod <[email protected]>

Author: github-actions[bot]

Project.toml

@@ -27,6 +27,7 @@ BenchmarkTools = "0.5"
 Cairo = "1.0"
 Colors = "0.12"
 DataFrames = "0.22"
+Fontconfig = "0.4"
 Gadfly = "1.3"
 Gaius = "0.5,0.6"
 LoopVectorization = "0.10"