[renovate] Update module golang.org/x/sync to v0.8.0

This MR contains the following updates:

Package	Type	Update	Change
golang.org/x/sync	require	minor	v0.7.0 -> v0.8.0

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This MR has been generated by Renovate Bot.

.gitlab/ci/.renovate.yml

 renovate:
     stage: tools
 
-    image: renovate/renovate:38.18.4
+    image: renovate/renovate:38.18.12
 
     variables:
         LOG_LEVEL: debug