Infra: Replace usage of Dependabot's reviewers with CODEOWNERS (#1182)

Author: yeikel

.github/CODEOWNERS

@@ -2,6 +2,7 @@
 
 
 # BACKEND
+gradle/libs.versions.toml   @kafbat/backend
 /build.gradle               @kafbat/backend
 /gradle.properties          @kafbat/backend
 /settings.gradle            @kafbat/backend

.github/dependabot.yml

@@ -7,8 +7,6 @@ updates:
     interval: weekly
     time: "10:00"
     timezone: Europe/London
-  reviewers:
-    - "kafbat/backend"
   open-pull-requests-limit: 10
   labels:
     - "type/dependencies"
@@ -27,8 +25,6 @@ updates:
     interval: weekly
     time: "10:00"
     timezone: Europe/London
-  reviewers:
-    - "kafbat/backend"
   open-pull-requests-limit: 10
   ignore:
   - dependency-name: "azul/zulu-openjdk-alpine"
@@ -43,8 +39,6 @@ updates:
     interval: weekly
     time: "10:00"
     timezone: Europe/London
-  reviewers:
-    - "kafbat/frontend"
   open-pull-requests-limit: 10
   versioning-strategy: increase-if-necessary
   labels:
@@ -64,8 +58,6 @@ updates:
     interval: weekly
     time: "10:00"
     timezone: Europe/London
-  reviewers:
-    - "kafbat/devops"
   open-pull-requests-limit: 10
   labels:
     - "type/dependencies"