Relax boundary on os-string in Alpine "main" freeze file [skip-ci]

Author: tarleb

alpine/freeze/pandoc-main.project.freeze

@@ -6,4 +6,4 @@ constraints: lua  +system-lua +pkg-config +hardcode-reg-keys -export-dynamic,
              pandoc-cli  +lua +nightly +server,
              directory +os-string,
              unix +os-string,
-             any.os-string ==2.0.6,
+             any.os-string >=2.0.6,