Pin major version of black in Pipfile

The formatting can change between major versions of black, so make sure
we're always using the same one.

1 files changed, 1 insertions, 1 deletions

diff --git a/Pipfile b/Pipfile
index 96d85c9..06def7b 100644
--- a/Pipfile
+++ b/Pipfile
@@ -7,7 +7,7 @@ verify_ssl = true
 websocket-client = "*"
 
 [dev-packages]
-black = "*"
+black = "==23.*"
 mock   = "*"
 pytest = "*"
 flake8 = "*"