Commits on Sep 8, 2024

1. postal-code-japan: suppress "literal string will be frozen in the fut… …

   …ure" warning
   
   Before change:
   
   ```console
   $ ruby test/run-test.rb -t PostalCodeJapanTest 2>&1 | grep red-datasets
   /Users/zzz/src/github.com/red-data-tools/red-datasets/lib/datasets/postal-code-japan.rb:45: warning: literal string will be frozen in the future
   ```
   
   After change:
   
   ```console
   $ ruby test/run-test.rb -t PostalCodeJapanTest 2>&1 | grep red-datasets
   ```

   

   tikkss committed Sep 8, 2024
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