Update bblfshdServer in helm staging

Signed-off-by: Maartje Eyskens <maartje@eyskens.me>

Author: meyskens

.helm-staging.yml

@@ -1,7 +1,7 @@
 bblfshdServer:
   image:
     repository: bblfsh/bblfshd
-    tag: v2.6.1
+    tag: v2.7.0
     pullPolicy: IfNotPresent
   drivers:
     install: true