Add base64 as a runtime dependency

[orien]

Context

EjsonWrapper uses the base64 library from the Ruby standard library:

ejson_wrapper/lib/ejson_wrapper/decrypt_private_key_with_kms.rb

Line 2 in 9799a3b

require 'base64'

In the forthcoming Ruby 3.4, the base64 library will be come a 'bundled' library. It must be included in gem sets to be used with Bundler.

In Ruby 3.3 a deprecation warning is shown:

warning: base64 was loaded from the standard library, but will no longer be part of the default gems since Ruby 3.4.0. Add base64 to your Gemfile or gemspec.

Example: https://github.com/envato/ejson_wrapper/actions/runs/7643628676/job/20826109584#step:4:6

Change

Add base64 as a runtime dependency in the gemspec.