Update slack links in docs and versions

[kalaiyarasiganeshalingam]

Purpose

$Subject

Part of ballerina-platform/ballerina-library#3463

Examples

Checklist

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

[codecov]

Codecov Report

Base: 92.11% // Head: 92.66% // Increases project coverage by +0.54% 🎉

Coverage data is based on head (b04d492) compared to base (bf46b8a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #446      +/-   ##
============================================
+ Coverage     92.11%   92.66%   +0.54%     
- Complexity       91       92       +1     
============================================
  Files            12       12              
  Lines           317      327      +10     
  Branches         56       54       -2     
============================================
+ Hits            292      303      +11     
  Misses           19       19              
+ Partials          6        5       -1     

Impacted Files	Coverage Δ
ballerina/scheduler.bal	98.24% <0.00%> (-1.76%)	⬇️
ballerina/init.bal	100.00% <0.00%> (ø)
...a/io/ballerina/stdlib/task/utils/TaskListener.java	93.33% <0.00%> (+13.33%)	⬆️

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