Update mkdocs.yml (#944)

java client：https://github.com/vesoft-inc/nebula-java/releases/tag/v2.6.1
nebula exchange：https://github.com/vesoft-inc/nebula-exchange/releases/tag/v2.6.1
nebula spark connector：https://github.com/vesoft-inc/nebula-spark-connector/releases/tag/v2.6.1
nebula flink connector： https://github.com/vesoft-inc/nebula-flink-connector/releases/tag/v2.6.1

mkdocs.yml

@@ -66,23 +66,23 @@ extra:
     release: 2.6.0
     branch: v2.6
   exchange:
-    release: 2.6.0
+    release: 2.6.1
     branch: v2.6
-    tag: v2.6.0
+    tag: v2.6.1
   importer:
     release: 2.6.0
     branch: v2.6.0
   algorithm:
     release: 2.5.1
     branch: v2.5
   sparkconnector:
-    release: 2.6.0
+    release: 2.6.1
     branch: v2.6
-    tag: v2.6.0
+    tag: v2.6.1
   flinkconnector:
-    release: 2.6.0
+    release: 2.6.1
     branch: v2.6
-    tag: v2.6.0
+    tag: v2.6.1
   dockercompose:
     release: 2.6.0
     branch: v2.6.0
@@ -103,8 +103,8 @@ extra:
     release: 2.5.0
     branch: v2.5.0
   java:
-    release: 2.6.0
-    branch: v2.6.0
+    release: 2.6.1
+    branch: v2.6.1
   python:
     release: 2.6.0
     branch: v2.6.0