ci: remove go1.13

Signed-off-by: Babak K. Shandiz <babakks@github.com>

Author: babakks

.github/workflows/ci.yml

@@ -5,7 +5,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go: [ '1.13', '1.21', '1.22', '1.23', '1.24', '1.25' ]
+        go: [ '1.21', '1.22', '1.23', '1.24', '1.25' ]
         os: [ ubuntu-latest, macos-latest, windows-latest ]
       fail-fast: false