fix: Service type property MUST be a string or a set of strings.

[sandrask]

Service type property MUST be a string or a set of strings.

Closes #3383

Signed-off-by: Sandra Vrtikapa [email protected]

[codecov]

Codecov Report

Merging #3389 (7048455) into main (2fa20ab) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #3389   +/-   ##
=======================================
  Coverage   87.96%   87.97%           
=======================================
  Files         331      332    +1     
  Lines       46019    46048   +29     
=======================================
+ Hits        40481    40510   +29     
  Misses       4102     4102           
  Partials     1436     1436           

Impacted Files	Coverage Δ
pkg/didcomm/protocol/didexchange/states.go	88.32% <100.00%> (+0.10%)	⬆️
pkg/didcomm/protocol/legacyconnection/states.go	87.25% <100.00%> (+0.04%)	⬆️
pkg/doc/did/doc.go	87.02% <100.00%> (+0.03%)	⬆️
pkg/internal/didcommutil/util.go	100.00% <100.00%> (ø)

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