Boot-time labs: use latest version of Buildroot

Good to get the latest version of the compiler

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>

labs/boot-time-build-system/boot-time-build-system.tex

@@ -34,12 +34,12 @@ \section{Choosing a Buildroot release}
 
 Go to the /code{~/boot-time-labs/rootfs/buildroot/} directory.
 
-We will use the latest revision of the \code{2021.02} release, which is
+We will use the latest revision of the \code{2022.02} release, which is
 one of Buildroot's long term releases:
 
 \begin{verbatim}
-git tag | grep 2021.02
-git checkout 2021.02.6
+git tag | grep 2022.02
+git checkout 2022.02.1
 \end{verbatim}
 
 \section{Configuring Buildroot}
@@ -85,7 +85,7 @@ \section{Configuring Buildroot}
 
 \item \code{Toolchain} menu
   \begin{itemize}
-  \item \code{GCC compiler Version}: select \code{gcc 10.x}. This allows
+  \item \code{GCC compiler Version}: select \code{gcc 11.x}. This allows
         to have the latest version of the compiler (at the time of this
 	writing), and the best available optimizations.
   \item Keep all the other settings unmodified. We will get