Replace slack channel link with discord server link

[Bhashinee]

Purpose

Related to ballerina-platform/ballerina-library#3463

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec

[codecov]

Codecov Report

Base: 85.01% // Head: 86.25% // Increases project coverage by +1.24% 🎉

Coverage data is based on head (aa53339) compared to base (7482847).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #475      +/-   ##
============================================
+ Coverage     85.01%   86.25%   +1.24%     
  Complexity       76       76              
============================================
  Files            16       16              
  Lines           387      422      +35     
  Branches         56       56              
============================================
+ Hits            329      364      +35     
  Misses           47       47              
  Partials         11       11              

Impacted Files	Coverage Δ
ballerina/hash.bal	100.00% <0.00%> (ø)
ballerina/hmac.bal	100.00% <0.00%> (ø)
ballerina/init.bal	100.00% <0.00%> (ø)
ballerina/sign_verify.bal	100.00% <0.00%> (ø)
ballerina/encrypt_decrypt.bal	100.00% <0.00%> (ø)
ballerina/private_public_key.bal	100.00% <0.00%> (ø)

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