Include time separator in CI prerelease

FAKE's SemVerHelper attempts to parse the prerelease as an Int32, which overflows with the inclusion of the full year. Include a T separator for time to prevent SemVerHelper from trying to be too helpful.

(cherry picked from commit bb57b58)

Author: russcam

build/scripts/Versioning.fsx

@@ -3,6 +3,7 @@
 #r @"FakeLib.dll"
 #r @"FSharp.Data.dll"
 #r @"System.Xml.Linq.dll"
+#nowarn "0044" //TODO sort out FAKE 5
 
 #load @"Projects.fsx"
 #load @"Paths.fsx"
@@ -51,7 +52,7 @@ module Versioning =
             v
         | ("canary", Some v) -> failwithf "cannot run canary release, expected no version number to specified but received %s" (v.ToString())
         | ("canary", None) -> 
-            let timestampedVersion = (sprintf "ci%s" (DateTime.UtcNow.ToString("MMddHHmmss")))
+            let timestampedVersion = (sprintf "ci%s" (DateTime.UtcNow.ToString("yyyyMMddTHHmmss")))
             tracefn "Canary suffix %s " timestampedVersion
             let canaryVersion = parse ((sprintf "%d.%d.0-%s" currentVersion.Major (currentVersion.Minor + 1) timestampedVersion).Trim())
             tracefn "Canary build increased currentVersion (%s) to (%s) " (currentVersion.ToString()) (canaryVersion.ToString())