Replace slack channel link with discord server link

[madhukaw]

Purpose

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (f855ac8) compared to base (1699448).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #399   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           20        22    +2     
  Branches        11        11           
=========================================
+ Hits            20        22    +2     

Impacted Files	Coverage Δ
ballerina/natives.bal	100.00% <0.00%> (ø)

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