[I] chore: Improve crates.io download stability [datafusion-comet]

["comphead (via GitHub)" <gi...@apache.org>]

comphead opened a new issue, #1644:
URL: https://github.com/apache/datafusion-comet/issues/1644

   ### Describe the bug
   
   Sometimes build failed with 
   ```
   warning: spurious network error (3 tries remaining): [7] Could not connect to server (Failed to connect to index.crates.io port 443 after 4002 ms: Could not connect to server)
   ```
   
   One proposal is to increase number of attempts another is to specify crates mirror like 
   
   ```
   [source.crates-io]
   index = "https://github.com/rust-lang/crates.io-index" # I set the source to the official github index
   ```
   
   ### Steps to reproduce
   
   _No response_
   
   ### Expected behavior
   
   _No response_
   
   ### Additional context
   
   _No response_


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