component/gcc: add version 12.3 and use https URL

component/gcc/buildout.cfg

@@ -15,7 +15,7 @@ parts =
 [gcc-common]
 recipe = slapos.recipe.cmmi
 shared = true
-url = http://ftp.gnu.org/gnu/gcc/gcc-${:version}/gcc-${:version}.tar.xz
+url = https://ftp.gnu.org/gnu/gcc/gcc-${:version}/gcc-${:version}.tar.xz
 pre-configure =
   set %(location)s/bin
   mkdir -p $1
@@ -76,3 +76,8 @@ patches =
 <= gcc-common
 version = 10.5.0
 md5sum = c7d1958570fbd1cd859b015774b9987a
+
+[gcc-12.3]
+<= gcc-common
+version = 12.3.0
+md5sum = 58a863b2a50e4d42eacc20fec419bc3b