This PR chagne the File's open mode to make sure we correctly download
the file in binary mode on windows, without doing that the gem will be
corrupt and will throw the following message.
```
ERROR: While executing gem ... (Gem::Package::FormatError)
package is corrupt, exception while verifying: Unexpected end of ZLIB input stream (Zlib::GzipFile::Error) in logstash-filter-dissect-1.0.8.gem
```
Fixes#6840
