Update buildkit to v0.11.1

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

.github/CODEOWNERS

 @alexellis
 @LucasRoesler
-@stefanprodan
+@welteki

chart/pro-builder/Chart.yaml

 apiVersion: v1
 description: Build OpenFaaS functions via a REST API
 name: pro-builder
-version: 0.3.7
+version: 0.3.8
 sources:
 - https://github.com/openfaas/faas-netes
 home: https://www.openfaas.com

chart/pro-builder/values.yaml

@@ -31,7 +31,7 @@ buildkit:
   # nodepool for the function builder pods, which is recycled often
   # through the use of spot instances or preemptive VMs.
   #
-  # image: moby/buildkit:v0.10.4
+  # image: moby/buildkit:v0.11.1
   # rootless: false
   # securityContext:
   #   runAsUser: 0
@@ -41,7 +41,7 @@ buildkit:
   # For a rootless configuration, preferred, if the configuration
   # and Kernel version of your Kubernetes nodes supports it
   # 
-  image: moby/buildkit:v0.11.0-rc3-rootless
+  image: moby/buildkit:v0.11.1-rootless
   rootless: true
   securityContext:
     # Needs Kubernetes >= 1.19