declare minimum version so that I stop getting cpantesters failures

bin/build_selenium_spec.pl

@@ -7,6 +7,8 @@ package Bin::build_selenium_spec;
 use strict;
 use warnings;
 
+use v5.28;
+
 no warnings 'experimental';
 use feature qw/signatures/;
 

lib/Selenium/Client.pm

@@ -5,6 +5,8 @@ package Selenium::Client;
 use strict;
 use warnings;
 
+use v5.28;
+
 no warnings 'experimental';
 use feature qw/signatures/;
 

lib/Selenium/Driver/Chrome.pm

@@ -3,6 +3,8 @@ package Selenium::Driver::Chrome;
 use strict;
 use warnings;
 
+use v5.28;
+
 no warnings 'experimental';
 use feature qw/signatures/;
 

lib/Selenium/Driver/Edge.pm

@@ -3,6 +3,8 @@ package Selenium::Driver::Edge;
 use strict;
 use warnings;
 
+use v5.28;
+
 no warnings 'experimental';
 use feature qw/signatures/;
 

lib/Selenium/Driver/Gecko.pm

@@ -3,6 +3,8 @@ package Selenium::Driver::Gecko;
 use strict;
 use warnings;
 
+use v5.28;
+
 no warnings 'experimental';
 use feature qw/signatures/;
 

lib/Selenium/Driver/Safari.pm

@@ -3,6 +3,8 @@ package Selenium::Driver::Safari;
 use strict;
 use warnings;
 
+use v5.28;
+
 no warnings 'experimental';
 use feature qw/signatures/;
 

lib/Selenium/Driver/SeleniumHQ/Jar.pm

@@ -3,6 +3,8 @@ package Selenium::Driver::SeleniumHQ::Jar;
 use strict;
 use warnings;
 
+use v5.28;
+
 no warnings 'experimental';
 use feature qw/signatures/;
 

lib/Selenium/Specification.pm

@@ -5,6 +5,8 @@ package Selenium::Specification;
 use strict;
 use warnings;
 
+use v5.28;
+
 no warnings 'experimental';
 use feature qw/signatures/;
 

lib/Selenium/Subclass.pm

@@ -5,6 +5,8 @@ package Selenium::Subclass;
 use strict;
 use warnings;
 
+use v5.28;
+
 no warnings 'experimental';
 use feature qw/signatures/;