[buildbot] Bump buildbot to v3.11.3 release

[LEDE Commits]

ynezz pushed a commit to buildbot.git, branch main:
https://git.openwrt.org/44ed9a39fddc4e79ec1276c3e5923766cbe19878

commit 44ed9a39fddc4e79ec1276c3e5923766cbe19878
Author: Petr Štetiar <ynezz at true.cz>
AuthorDate: Wed May 22 10:05:50 2024 +0000

    Bump buildbot to v3.11.3 release
    
    https://github.com/buildbot/buildbot/releases/tag/v3.11.3
    
    Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
 .github/workflows/build-push.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/build-push.yml b/.github/workflows/build-push.yml
index 77f8b16..4a2aef0 100644
--- a/.github/workflows/build-push.yml
+++ b/.github/workflows/build-push.yml
@@ -8,7 +8,7 @@ on:
   pull_request:
 
 env:
-  BUILDBOT_VERSION: 3.11.1
+  BUILDBOT_VERSION: 3.11.3
   GITHUB_SHA_LEN: 8
 
 concurrency: