Release 7.9.0

[superchilled]

This PR:

• Updates the Messages API implementation to ass support for video and file messages types to the Viber channel, and sticker messages in the WhatsApp channel. #260
• Updates the Numbers API implementation to use Basic authentication. #262

[codecov-commenter]

Codecov Report

Merging #264 (15d9432) into main (1e33d4c) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 15d9432 differs from pull request most recent head e03a29b. Consider uploading reports for the commit e03a29b to get more accurate results

@@            Coverage Diff             @@
##             main     #264      +/-   ##
==========================================
+ Coverage   97.73%   97.74%   +0.01%     
==========================================
  Files          71       71              
  Lines        1457     1464       +7     
==========================================
+ Hits         1424     1431       +7     
  Misses         33       33              

Impacted Files	Coverage Δ
lib/vonage/messaging/channels/viber.rb	100.00% <100.00%> (ø)
lib/vonage/messaging/channels/whats_app.rb	100.00% <100.00%> (ø)
lib/vonage/numbers.rb	100.00% <100.00%> (ø)

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