fix: update community Slack link

[ceohockey60]

SUMMARY

Slack link expires, so updating to a new one.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-commenter]

Codecov Report

Merging #10360 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10360      +/-   ##
==========================================
- Coverage   70.71%   70.66%   -0.05%     
==========================================
  Files         601      601              
  Lines       32271    32262       -9     
  Branches     3275     3275              
==========================================
- Hits        22821    22799      -22     
- Misses       9346     9357      +11     
- Partials      104      106       +2     

Flag	Coverage Δ
#cypress	55.63% <ø> (-0.15%)	⬇️
#javascript	59.61% <ø> (ø)
#python	69.94% <ø> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset-frontend/src/reduxUtils.ts	70.88% <0.00%> (-8.87%)	⬇️
superset-frontend/src/SqlLab/actions/sqlLab.js	62.60% <0.00%> (-2.57%)	⬇️
superset-frontend/src/SqlLab/reducers/sqlLab.js	39.41% <0.00%> (-1.66%)	⬇️
superset/sql_parse.py	99.30% <0.00%> (-0.01%)	⬇️
superset/errors.py	100.00% <0.00%> (ø)
superset/viz_sip38.py	0.00% <0.00%> (ø)
...et-frontend/src/messageToasts/components/Toast.tsx	100.00% <0.00%> (+3.12%)	⬆️
...perset-frontend/src/messageToasts/actions/index.js	100.00% <0.00%> (+8.33%)	⬆️

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