chore: install cargo-audit with the fix feature as part of publish (#1010)

This should hopefully let CI finish and not exit with code 1.

.changes/config.json

@@ -7,6 +7,7 @@
       "prepublish": [
         "sudo apt-get update",
         "sudo apt-get install -y webkit2gtk-4.0",
+        "cargo install cargo-audit --features=fix",
         {
           "command": "cargo generate-lockfile",
           "dryRunCommand": true,
@@ -24,7 +25,7 @@
           "pipe": true
         },
         {
-          "command": "cargo audit fix --dry-run",
+          "command": "cargo audit fix --dry-run true",
           "dryRunCommand": true,
           "runFromRoot": true,
           "pipe": true