GumGum Bid Adapter: stringify dsa object (prebid#11386)

* displaymanager: add field for displaymanager and displaymanagerver

* fix: displayManager to include 'gumgum'

* fix: test case

* Bug, stringifying DSA object.

---------

Co-authored-by: ahzgg <abel.herrera@gumgum.com>
Co-authored-by: ahzgg <163184035+ahzgg@users.noreply.github.com>

modules/gumgumBidAdapter.js

@@ -424,7 +424,7 @@ function buildRequests(validBidRequests, bidderRequest) {
     }
     const dsa = deepAccess(bidderRequest, 'ortb2.regs.ext.dsa');
     if (dsa) {
-      data.dsa = dsa
+      data.dsa = JSON.stringify(dsa)
     }
     if (coppa) {
       data.coppa = coppa;

test/spec/modules/gumgumBidAdapter_spec.js

@@ -610,7 +610,7 @@ describe('gumgumAdapter', function () {
       // Call the buildRequests function to generate the bid request
       const [bidRequest] = spec.buildRequests(bidRequests, fakeBidRequest);
       // Assert that the DSA information in the bid request matches the provided ORTB2 data
-      expect(bidRequest.data.dsa).to.deep.equal(fakeBidRequest.ortb2.regs.ext.dsa);
+      expect(bidRequest.data.dsa).to.deep.equal(JSON.stringify(fakeBidRequest.ortb2.regs.ext.dsa));
     });
     it('should not set coppa parameter if coppa config is set to false', function () {
       config.setConfig({