Rollback to released version numbers of stringio and strscan

ext/stringio/stringio.c

@@ -13,7 +13,7 @@
 **********************************************************************/
 
 static const char *const
-STRINGIO_VERSION = "3.1.1";
+STRINGIO_VERSION = "3.1.0";
 
 #include "ruby.h"
 #include "ruby/io.h"

ext/strscan/strscan.c

@@ -22,7 +22,7 @@ extern size_t onig_region_memsize(const struct re_registers *regs);
 
 #include <stdbool.h>
 
-#define STRSCAN_VERSION "3.0.8"
+#define STRSCAN_VERSION "3.0.7"
 
 /* =======================================================================
                          Data Type Definitions