Relax upper version bound for text

Author: maoe

threadscope.cabal

@@ -59,7 +59,7 @@ Executable threadscope
                      ghc-events >= 0.13 && < 0.18,
                      containers >= 0.2 && < 0.7,
                      deepseq >= 1.1,
-                     text < 1.3,
+                     text < 2.1,
                      time >= 1.1 && < 1.12,
                      bytestring < 0.12,
                      file-embed < 0.1,