[ruby/rubygems] Fix gzip cache corruption when recovering from HTTP 416 responsesHEADmaster

When a Range request returns 416 (Range Not Satisfiable), the recovery
path manually added an "Accept-Encoding: gzip" header before retrying.
This bypasses Ruby's automatic gzip decompression mechanism.

Ruby's Net::HTTP only sets decode_content=true (enabling automatic
decompression) when Accept-Encoding is NOT present in the request
headers. By manually setting this header, the decode_content flag
remained false, causing gzip-compressed response bodies to be written
directly to the compact index cache without decompression.

This resulted in "ArgumentError: invalid byte sequence in UTF-8" errors
when the corrupted cache was later read and parsed as text.

The fix removes the explicit Accept-Encoding header, allowing Ruby's
Net::HTTP to handle gzip compression transparently (as it does for all
other requests). Ruby will still add Accept-Encoding: gzip automatically
AND properly set decode_content=true for automatic decompression.

Fixes https://github.com/ruby/rubygems/pull/9271

https://github.com/ruby/rubygems/commit/b48b090e38

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