Fix .gdnsuppress path

Author: jviau

eng/ci/integration-tests.yml

@@ -33,7 +33,7 @@ extends:
 
     sdl:
       suppression:
-        suppressionFile: /eng/sdl/.gdnsuppress
+        suppressionFile: $(Build.SourcesDirectory)/eng/sdl/.gdnsuppress
 
     stages:
     - stage: Test

eng/ci/official-build.yml

@@ -50,7 +50,7 @@ extends:
         # Move codeql for source languages to source analysis stage
         runSourceLanguagesInSourceAnalysis: true
       suppression:
-        suppressionFile: /eng/sdl/.gdnsuppress
+        suppressionFile: $(Build.SourcesDirectory)/eng/sdl/.gdnsuppress
 
     stages:
     - stage: Initialize