[DRE-maint] Bug#976280: ruby-azure-storage: ftbfs with ruby-faraday 1.0

[Pirate Praveen]

Package: ruby-azure-storage
Version: 0.15.0~preview-2
Severity: serious

Autopkgtest fails with error (rebuild should see the same failure)

/usr/lib/ruby/2.7.0/rubygems/dependency.rb:313:in `to_specs': Could not 
find 'faraday' (~> 0.9) - did find: [faraday-1.1.0] 
(Gem::MissingSpecVersionError)

Full log 
https://ci.debian.net/data/autopkgtest/testing/amd64/r/ruby-azure-storage/8564803/log.gz

Though this is a leaf package and replaced by ruby-azure-storage-common 
and ruby-azure-storage-blob. We should remove this package from the 
archive.