profiles: mask <sys-devel/gcc-11 (GCC 10 is EOL)

GCC 10 is EOL - it has been since GCC 10.5 was released in July.

It's hard to get the balance right here - if we mask immediately on the release
of .5 of a series, some people aren't happy, and it's indeed kind of a nuisance
for stabling the last version of a series too. (I did it the day-of for 9.5.x
and had some feedback on it from users.)

In any case, by now, it's certainly overdue. Move to GCC 11 or newer, please.

Bug: https://bugs.gentoo.org/917507
Signed-off-by: Sam James <sam@gentoo.org>
Closes: https://github.com/gentoo/gentoo/pull/33872
Signed-off-by: Sam James <sam@gentoo.org>

profiles/package.mask

@@ -33,6 +33,13 @@
 
 #--- END OF EXAMPLES ---
 
+# Sam James <sam@gentoo.org> (2023-11-19)
+# GCC 10 and older no longer receive upstream support or fixes for
+# bugs. Please switch to a newer GCC version using gcc-config.
+# The lowest supported version of GCC is GCC 11.
+<sys-devel/gcc-11
+<sys-devel/kgcc64-11
+
 # Sam James <sam@gentoo.org> (2023-11-18)
 # Lots of applications need porting, bug #917537.
 >=dev-libs/libxml2-2.12.0
@@ -489,12 +496,6 @@ sys-cluster/slurm
 # See: <https://github.com/martijnbastiaan/doctest-parallel/issues/45>
 dev-haskell/doctest-parallel
 
-# Sam James <sam@gentoo.org> (2022-05-28)
-# GCC 9 and older no longer receive upstream support or fixes for
-# bugs. Please switch to a newer GCC version using gcc-config.
-# The lowest supported version of GCC is GCC 10.
-<sys-devel/gcc-10
-
 # Joonas Niilola <juippis@gentoo.org> (2022-04-29)
 # Apparently the "b" in version means "beta". 3.24 is available, we
 # should update to that. #841437