The "since" attributes added here reflect the first release after
each deprecation was added. We will use this to remove oldest
deprecations (by some measure of oldest) in an upcoming release.

The Ruby script used to make this change is provided here:

```ruby
Dir[ARGV[0] + "/**/*.java"].each do |file|
  file_lines = File.readlines(file)
  file_lines.each_with_index do |line, i|
    line.gsub!(/@deprecated\S*$/) do
      sha = `git blame -L #{i+1},#{i+1} #{file}`.split(" ")[0]
      tag = `git describe --abbrev=0 --tags --contains #{sha}`.split("~")[0]
      "@deprecated(since = \"#{tag}\")"
    end
  end
  File.write(file, file_lines.join(''))
  puts "process #{file}"
end
```

There may be places where sources moved or the deprecation line
does not reflect the true earliest version, but worst case the
deprecations stick around a little longer, or require manual
investigation.

Several tags have been manually updated to the next logical one:

* jruby-openssl-* tags have been updated to the nearest JRuby
  release tag.
* All preview and RC tags have been updated to their associated
  non-prerelease versions.
* One bogus tag "list" was removed from the repo and all "since"
  lines updated to point at the nearest JRuby release tag.
* The "10.0" deprecations have been updated to "10.0.0.0" so they
  point at a full, valid tag and release version.
* The "9.4" deprecations added to methods that *should have* been
  deprecated in 9.4.x were modified to "10.0.0.0" because that is
  the first release in which they were *actually* deprecated.