fix some pipeline caches?

ci/lint.yml

@@ -7,6 +7,7 @@ image_resource:
 # This should cache clippy
 caches:
 - path: "./.rustup/"
+- path: "./.cargo/"
 - path: "./target/"
 
 inputs:

ci/test.yml

@@ -5,6 +5,7 @@ image_resource:
   source: {repository: rust}
 
 caches:
+- path: "./.cargo/"
 - path: "./target/"
 
 inputs: