chore: update to use 0.1.8 of the rust builder

Author: casibbald

builder.toml

@@ -37,8 +37,8 @@ description = "Ubuntu 22.04 Jammy Jellyfish base image with buildpacks for Java,
   version = "4.0.3"
 
 [[buildpacks]]
-  uri = "docker://ghcr.io/octopilot/rust:0.1.7"
-  version = "0.1.7"
+  uri = "docker://ghcr.io/octopilot/rust:0.1.8"
+  version = "0.1.8"
 
 [[buildpacks]]
   uri = "docker://ghcr.io/octopilot/helm:0.1.3"
@@ -105,7 +105,7 @@ description = "Ubuntu 22.04 Jammy Jellyfish base image with buildpacks for Java,
 
   [[order.group]]
     id = "octopilot/rust"
-    version = "0.1.7"
+    version = "0.1.8"
 
 [[order]]