Bump Spin version to v3.1.2

Signed-off-by: Brian H <[email protected]>

Author: fibonacci1729

.github/workflows/build.yaml

@@ -13,11 +13,6 @@ on:
 permissions:
   contents: write
 
-# Construct a concurrency group to be shared across workflow runs.
-# The default behavior ensures that only one is running at a time, with
-# all others queuing and thus not interrupting runs that are in-flight.
-concurrency: ${{ github.workflow }}
-
 env:
   PROGRAM_NAME: trigger-mqtt