Don't print a warning when bigdecimal is required on ruby-3.4+

Ruby-3.4+ prints a warning, if bigdecimal is required but not in the Gemfile.
But it's a false positive, since we enable bigdecimal depending features only if it's available.
And most people don't need these features.

Fixes #569

ext/pg_text_decoder.c

@@ -174,7 +174,7 @@ pg_text_dec_numeric(t_pg_coder *conv, const char *val, int len, int tuple, int f
 static VALUE
 init_pg_text_decoder_numeric(VALUE rb_mPG_TextDecoder)
 {
-	rb_require("bigdecimal");
+	rb_funcall(rb_mPG, rb_intern("require_bigdecimal_without_warning"), 0);
 	s_id_BigDecimal = rb_intern("BigDecimal");
 
 	/* dummy = rb_define_class_under( rb_mPG_TextDecoder, "Numeric", rb_cPG_SimpleDecoder ); */

ext/pg_text_encoder.c

@@ -377,7 +377,7 @@ init_pg_text_encoder_numeric(VALUE rb_mPG_TextDecoder)
 {
 	s_str_F = rb_str_freeze(rb_str_new_cstr("F"));
 	rb_global_variable(&s_str_F);
-	rb_require("bigdecimal");
+	rb_funcall(rb_mPG, rb_intern("require_bigdecimal_without_warning"), 0);
 	s_cBigDecimal = rb_const_get(rb_cObject, rb_intern("BigDecimal"));
 
 	/* dummy = rb_define_class_under( rb_mPG_TextEncoder, "Numeric", rb_cPG_SimpleEncoder ); */

lib/pg.rb

@@ -126,4 +126,14 @@ def warn(str, category=nil)
 		Warning.extend(TruffleFixWarn)
 	end
 
+	# Ruby-3.4+ prints a warning, if bigdecimal is required but not in the Gemfile.
+	# But it's a false positive, since we enable bigdecimal depending features only if it's available.
+	# And most people don't need these features.
+	def self.require_bigdecimal_without_warning
+		oldverb, $VERBOSE = $VERBOSE, nil
+		require "bigdecimal"
+	ensure
+		$VERBOSE = oldverb
+	end
+
 end # module PG

lib/pg/basic_type_map_for_queries.rb

@@ -167,7 +167,7 @@ def get_array_type(value)
 	end
 
 	begin
-		require "bigdecimal"
+		PG.require_bigdecimal_without_warning
 		has_bigdecimal = true
 	rescue LoadError
 	end

lib/pg/basic_type_registry.rb

@@ -233,7 +233,7 @@ def register_default_types
 		alias_type    0, 'oid',  'int2'
 
 		begin
-			require "bigdecimal"
+			PG.require_bigdecimal_without_warning
 			register_type 0, 'numeric', PG::TextEncoder::Numeric, PG::TextDecoder::Numeric
 		rescue LoadError
 		end

spec/helpers.rb

@@ -711,7 +711,7 @@ def set_etc_hosts(hostaddr)
 	config.filter_run_excluding( :ipv6 ) if Addrinfo.getaddrinfo("localhost", nil, nil, :STREAM).size < 2
 	config.filter_run_excluding( :ractor ) unless defined?(Ractor)
 	begin
-		require "bigdecimal"
+		PG.require_bigdecimal_without_warning
 	rescue LoadError
 		config.filter_run_excluding( :bigdecimal )
 	end