disable unit book github workflow

Author: frisitano

.github/workflows/unit.yml

@@ -46,10 +46,10 @@ jobs:
             args: -p "reth-scroll-*" -p "scroll-alloy-*" --locked
             partition: 1
             total_partitions: 1
-          - type: book
-            args: --manifest-path book/sources/Cargo.toml
-            partition: 1
-            total_partitions: 1
+          # - type: book
+          #   args: --manifest-path book/sources/Cargo.toml
+          #   partition: 1
+          #   total_partitions: 1
     timeout-minutes: 30
     steps:
       - name: Free up disk space