package/gcc: switch to gcc 11.x as the default

Even if gcc 10.x is still maintained for some time, switch to gcc 11.x
since it has been released since 2021-04-27 and gcc 12.x is available
since "2022-05-10".

We have been having toolchains in the autobuilders with gcc 11.x since
mid-June 2021, so the vast majority of the problems should have
already been solved.

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/gcc/Config.in.host

@@ -4,7 +4,7 @@ choice
 	prompt "GCC compiler Version"
 	default BR2_GCC_VERSION_ARC if BR2_arc
 	default BR2_GCC_VERSION_POWERPC_SPE if BR2_powerpc_SPE
-	default BR2_GCC_VERSION_10_X
+	default BR2_GCC_VERSION_11_X
 	help
 	  Select the version of gcc you wish to use.