fix(template): yml schema link

[tecton]

bug: https://msazure.visualstudio.com/Microsoft%20Teams%20Extensibility/_workitems/edit/32520604

Use updated yaml schema link.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.99%. Comparing base (abccd1f) to head (f614709).
Report is 4 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff            @@
##              dev   #14186    +/-   ##
========================================
  Coverage   89.99%   89.99%            
========================================
  Files         646      646            
  Lines       38677    38677            
  Branches     7607     7772   +165     
========================================
+ Hits        34807    34809     +2     
+ Misses       1756     1755     -1     
+ Partials     2114     2113     -1     

see 2 files with indirect coverage changes

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