MINOR: [Ruby] Fixed credential information of ClickHouse API (#13999)
MINOR: [Ruby] Fixed credential information of ClickHouse API (#13999)

## What I did
- Fixed credential information of ClickHouse API at README.md
    - Latest Information was changed
    - https://clickhouse.com/docs/ru/getting-started/playground/

## What I checked
- I ran the command in my local environment.

```ruby
# red-arrow.rb
params = {
  query: "SELECT WatchID as watch FROM hits LIMIT 10 FORMAT Arrow",
  user: "play",
  password: "",
  database: "default"
}
uri = URI('https://play.clickhouse.com:443/')
uri.query = URI.encode_www_form(params)
resp = Net::HTTP.get(uri)
table = Arrow::Table.load(Arrow::Buffer.new(resp))
p table
```
```console
% ruby red-arrow.rb
#<Arrow::Table:0x11f8e0c18 ptr=0x11f6dced0>
                      watch
 0      8120543446287442873
 1      9110818468285196899
 2      8156744413230856864
 3      5206346422301499756
 4      6308646140879811077
 5      6635790769678439148
 6      4894690465724379622
 7      6864353419233967042
 8      8740403056911509777
 9      8924809397503602651
```

Authored-by: otegami <5d6d6c607485c71332b01c6ecd647a0b89f64ae4@gmail.com>
Signed-off-by: Sutou Kouhei <73218711cdd5d5c30ac66da3cc4d9d9204caf34b@clear-code.com>
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