Remove unneeded 'use v6' from util/

Part of #3905

Author: coke

util/issue-with-all-pod6.p6

@@ -1,7 +1,5 @@
 #!/usr/bin/env raku
 
-use v6;
-
 my @docs = qx/git ls-files | grep "\.pod6"/.lines;
 
 for @docs -> $d {

util/list-missing-methods.p6

@@ -1,5 +1,5 @@
 #! /usr/bin/env raku
-use v6;
+
 use Telemetry; # used so we can check these docs
 # stubs
 role Result{...}; role Ok{...}; role Err{...}; role ErrKind{...}; role UncheckableType {...}

util/missing-types.p6

@@ -1,5 +1,5 @@
 #!/usr/bin/env raku
-use v6;
+
 use lib 'lib';
 use Perl6::TypeGraph;
 

util/new-type.p6

@@ -1,7 +1,5 @@
 #!/usr/bin/env raku
 
-use v6;
-
 sub MAIN($typename, :$kind='class') {
     my @path-chunks =  $typename.split('::');
     my $filename = @path-chunks.pop ~ '.pod6';

util/perl-nbsp.p6

@@ -1,5 +1,5 @@
 #!/usr/bin/env raku
-use v6;
+
 use lib 'lib';
 use Test-Files;
 

util/to-raku.p6

@@ -1,12 +1,10 @@
 #!/usr/bin/env raku
-use v6;
+
 use lib 'lib';
 use Test-Files;
 
-
 my $degree = %*ENV<UTIL_THREADS> // 2;
 
-
 multi sub replace-perl6(Str $file) {
     my $content = my $original-content = slurp $file;
     $content ~~ s:g/ 'Perl' [ \s+ | \x[00A0] ] '6' /Raku/;

util/unskip.p6

@@ -1,7 +1,5 @@
 #!/usr/bin/env raku
 
-use v6;
-
 use File::Temp;
 
 use lib 'lib';