Remove 6.4.x from dependabot.yml since it is commercial now

Author: artembilan

.github/dependabot.yml

@@ -89,51 +89,6 @@ updates:
           - com.thoughtworks.xstream:xstream
           - org.springframework.security*
 
-  - package-ecosystem: gradle
-    target-branch: 6.4.x
-    directory: /
-    schedule:
-      interval: weekly
-      day: sunday
-    ignore:
-      - dependency-name: '*'
-        update-types:
-          - version-update:semver-major
-          - version-update:semver-minor
-    open-pull-requests-limit: 10
-    labels:
-      - 'type: dependency-upgrade'
-    groups:
-      development-dependencies:
-        update-types:
-          - patch
-        patterns:
-          - org.gradle.*
-          - com.github.spotbugs
-          - io.spring.*
-          - org.antora
-          - com.google.protobuf
-          - io.micrometer:micrometer-docs-generator
-          - com.willowtreeapps.assertk:assertk-jvm
-          - org.jetbrains.dokka
-          - org.apache.activemq*
-          - org.aspectj*
-          - org.awaitility:awaitility
-          - org.apache.commons:commons-dbcp2
-          - org.apache.derby
-          - com.icegreen:greenmail
-          - org.hibernate.orm*
-          - org.testcontainers*
-          - org.hsqldb:hsqldb
-          - com.h2database:h2
-          - org.postgresql:postgresql
-          - mysql:mysql-connector-java
-          - com.oracle.database.jdbc:ojdbc11
-          - org.apache.tomcat.embed:tomcat-embed-websocket
-          - org.xmlunit:xmlunit-assertj3
-          - com.thoughtworks.xstream:xstream
-          - org.springframework.security*
-
   - package-ecosystem: github-actions
     directory: /
     schedule:
@@ -158,16 +113,3 @@ updates:
       development-dependencies:
         patterns:
           - '*'
-
-  - package-ecosystem: github-actions
-    target-branch: 6.4.x
-    directory: /
-    schedule:
-      interval: weekly
-      day: sunday
-    labels:
-      - 'type: task'
-    groups:
-      development-dependencies:
-        patterns:
-          - '*'