avoid example crash under centos 7.51

Author: alcatel

plotters/Cargo.toml

@@ -32,10 +32,10 @@ optional = true
 path = "../plotters-svg"
 
 [target.'cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))'.dependencies]
-ttf-parser = { version = "0.17.0", optional = true }
+ttf-parser = { version = "0.20.0", optional = true }
 lazy_static = { version = "1.4.0", optional = true }
 pathfinder_geometry = { version = "0.5.1", optional = true }
-font-kit = { version = "0.11.0", optional = true }
+font-kit = { version = "0.13.0", optional = true }
 ab_glyph = { version = "0.2.12", optional = true }
 once_cell = { version = "1.8.0", optional = true }