Update she-bang of tools/build .raku scripts

tools/build/makeMAGIC_INC_DEC.raku

@@ -1,4 +1,4 @@
-#!/usr/bin/env perl6
+#!/usr/bin/env raku
 
 # This script reads the Rakudo/Internals.pm6 file from STDIN, and generates
 # the necessary lookup hashes for making magic Str .succ / .pred work, and

tools/build/makeNATIVE_ARRAY.raku

@@ -1,4 +1,4 @@
-#!/usr/bin/env perl6
+#!/usr/bin/env raku
 
 # This script reads the native_array.pm6 file from STDIN, and generates the
 # intarray, numarray and strarray roles in it, and writes it to STDOUT.

tools/build/makeNATIVE_SHAPED_ARRAY.raku

@@ -1,4 +1,4 @@
-#!/usr/bin/env perl6
+#!/usr/bin/env raku
 
 # This script reads the native_array.pm file from STDIN, and generates the
 # shapedintarray, shapednumarray and shapedstrarray roles in it, and writes

tools/build/makeSLICE.raku

@@ -1,4 +1,4 @@
-#!/usr/bin/env perl6
+#!/usr/bin/env raku
 
 # This script generates the logic for doing adverbed slices, usually part of
 # the core settings as "src/core/SLICE.pm6".  When run, it will generate the

tools/build/makeUNIPROP.raku

@@ -1,4 +1,5 @@
-#!/usr/bin/env perl6
+#!/usr/bin/env raku
+
 # This script generates the Unicode canonical alternates/shortnames ->
 # canonical full names hash and the mappings of Unicode properties to
 # Str, Bool, and other types.in /src/core/Cool.pm

tools/build/upgrade-repository.raku

@@ -1,4 +1,4 @@
-#!/usr/bin/env perl6
+#!/usr/bin/env raku
 
 CompUnit::Repository::Installation.new(:prefix(@*ARGS[0])).upgrade-repository;