Switch from reviewers to code owners

Switch from reviewers to code owners. This is the new style that GitHub
now expects, hence the shift. Lastly, update the milestone version while
 touching this file

Author: smcvb

.github/CODEOWNERS

@@ -0,0 +1,5 @@
+*   @m1l4n54v1c
+*   @MGathier
+*   @schananas
+*   @smcvb
+*   @trimoq

.github/dependabot.yml

@@ -10,13 +10,7 @@ updates:
     labels:
       - "Type: Dependency Upgrade"
       - "Priority 1: Must"
-    reviewers:
-      - "m1l4n54v1c"
-      - "MGathier"
-      - "schananas"
-      - "smcvb"
-      - "trimoq"
-    milestone: 31
+    milestone: 38
     groups:
       github-dependencies:
         update-types:
@@ -33,13 +27,7 @@ updates:
     labels:
       - "Type: Dependency Upgrade"
       - "Priority 1: Must"
-    reviewers:
-      - "m1l4n54v1c"
-      - "MGathier"
-      - "schananas"
-      - "smcvb"
-      - "trimoq"
-    milestone: 31
+    milestone: 38
     groups:
       maven-dependencies:
         update-types: