build: configure branch 6.4.4-sp as a release branch (#1365)

Author: thiagotnunes

.github/release-please.yml

@@ -16,3 +16,6 @@ branches:
   - releaseType: java-lts
     bumpMinorPreMajor: true
     branch: 3.3.3-sp
+  - releaseType: java-lts
+    bumpMinorPreMajor: true
+    branch: 6.4.4-sp

.github/sync-repo-settings.yaml

@@ -104,6 +104,24 @@ branchProtectionRules:
       - checkstyle
       - compile (8)
       - compile (11)
+  - pattern: 6.4.4-sp
+    isAdminEnforced: true
+    requiredApprovingReviewCount: 1
+    requiresCodeOwnerReviews: true
+    requiresStrictStatusChecks: false
+    requiredStatusCheckContexts:
+      - dependencies (8)
+      - dependencies (11)
+      - linkage-monitor
+      - lint
+      - clirr
+      - units (8)
+      - units (11)
+      - 'Kokoro - Test: Integration'
+      - cla/google
+      - checkstyle
+      - compile (8)
+      - compile (11)
 permissionRules:
   - team: yoshi-admins
     permission: admin