.gitlab-ci.yml: Use buildstream 1.1.3-4-g0916d81

Do not use 1.1.3 so we can get the fix for
BuildStream/buildstream#325

.gitlab-ci.yml

@@ -23,7 +23,7 @@ stages:
 
 before_script:
   - export PATH=~/.local/bin:${PATH}
-  - export BST_SHA='e91dc8336074d22126e559a29e23ef2d52c5506a' #  1.1.2
+  - export BST_SHA='0916d81e25bb57e4f6d8109fefcbd0ed8f33c371' #  1.1.3-4-g0916d81e
   - git clone https://gitlab.com/BuildStream/buildstream.git
   - git -C buildstream checkout $BST_SHA
   - pip3 install --user buildstream/