[buildbot] Bump to latest Buildbot release 3.0.1

[LEDE Commits]

ynezz pushed a commit to buildbot.git, branch master:
https://git.openwrt.org/bf10f24b0909be86ff35fc1a342901bb22696a83

commit bf10f24b0909be86ff35fc1a342901bb22696a83
Author: Petr Štetiar <ynezz at true.cz>
AuthorDate: Mon Mar 15 08:34:58 2021 +0100

    Bump to latest Buildbot release 3.0.1
    
    Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4551da1..a964cce 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,5 @@
 variables:
-  BUILDBOT_VERSION: 3.0.0
+  BUILDBOT_VERSION: 3.0.1
 
 include:
   - local: .gitlab/docker.yml