chore: bump minimum Go version to 1.21

Signed-off-by: Mark Sagi-Kazar <[email protected]>

Author: sagikazarmark

.github/workflows/ci.yaml

@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        go: ["1.20", "1.21", "1.22", "1.23", "1.24"]
+        go: ["1.21", "1.22", "1.23", "1.24"]
 
     steps:
       - name: Checkout repository

go.mod

@@ -1,6 +1,6 @@
 module github.com/spf13/cast
 
-go 1.19
+go 1.21.0
 
 require github.com/frankban/quicktest v1.14.6