Smartx Bid Adapter: update custom header (#9291)

* Add smartclipBidAdapter

* smartxBidAdapter.js - removed unused variables, removed debug, added window before the outstream related functions

* - made outstream player configurable

* remove wrong named files

* camelcase

* fix

* Out-Stream render update to SmartPlay 5.2

* ESlint fix

* ESlint fix

* ESlint fix

* adjust tests, fixes

* ESlint

* adjusted desired bitrate examples

* added bid.meta.advertiserDomains support

* bug fix for numeric elementID outstream render

* fix renderer url

* support for floors module

* bugfixes to be openRTB 2.5 compliant

* update internal renderer usage

* remove unused outstream_function logic

* bugfix outstream options for default outstream renderer configuration

* [PREB-10] fix empty title not configurable

* add pbjs version

* testing with outstream 5.3.0

* pbjs version into content.ext

* made visibilityThreshold configurable

* adjust position of pbjs version

* Merge branch 'master' of https://github.com/prebid/Prebid.js into HEAD

* update smartclip outstream player version to support outstream 6 release along with necessary config changes

* Add support for schain

* vacuuming

* update custom header x-openrtb-version to 2.5

Co-authored-by: smartclip AdTechnology <adtech@smartclip.com>
Co-authored-by: Gino Cirlini <adtech@smartclip.tv>
Co-authored-by: smartclip-adtech <65160328+smartclip-adtech@users.noreply.github.com>

modules/smartxBidAdapter.js

@@ -245,7 +245,7 @@ export const spec = {
         options: {
           contentType: 'application/json',
           customHeaders: {
-            'x-openrtb-version': '2.3'
+            'x-openrtb-version': '2.5'
           }
         }
       };