[buildbot] buildworker,buildmaster: bump Debian to version 11

[LEDE Commits]

ynezz pushed a commit to buildbot.git, branch master:
https://git.openwrt.org/f2744543fa8027117b254ba2f4fa4366149d5bfb

commit f2744543fa8027117b254ba2f4fa4366149d5bfb
Author: Petr Štetiar <ynezz at true.cz>
AuthorDate: Mon May 15 09:14:48 2023 +0200

    buildworker,buildmaster: bump Debian to version 11
    
    Debian 10 LTS support ends on 6/2024, so it makes no sense to use it as
    a base for 23.05 release, so lets switch to Debian 11 which should've
    LTS support till 6/2026.
    
    Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
 docker/buildmaster/Dockerfile | 2 +-
 docker/buildworker/Dockerfile | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/docker/buildmaster/Dockerfile b/docker/buildmaster/Dockerfile
index f4b3afb..8d21245 100644
--- a/docker/buildmaster/Dockerfile
+++ b/docker/buildmaster/Dockerfile
@@ -1,4 +1,4 @@
-FROM        debian:10
+FROM        debian:11
 MAINTAINER  OpenWrt Maintainers
 
 ARG         DEBIAN_FRONTEND=noninteractive
diff --git a/docker/buildworker/Dockerfile b/docker/buildworker/Dockerfile
index 5219f92..55babe4 100644
--- a/docker/buildworker/Dockerfile
+++ b/docker/buildworker/Dockerfile
@@ -1,4 +1,4 @@
-FROM        debian:10
+FROM        debian:11
 MAINTAINER  OpenWrt Maintainers
 
 ARG         DEBIAN_FRONTEND=noninteractive