ext: Update ext/sst/README.md for v22.1 release

Change-Id: I3221bbc4e4bf1d7a2bd7516873c7bfcf08bebde5
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/65924
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
diff --git a/ext/sst/README.md b/ext/sst/README.md
index d9bbe85..49f5634 100644
--- a/ext/sst/README.md
+++ b/ext/sst/README.md
@@ -62,7 +62,7 @@
 Downloading the built bootloader containing a Linux Kernel and a workload,
 
 ```sh
-wget http://dist.gem5.org/dist/v22-0/misc/riscv/bbl-busybox-boot-exit
+wget http://dist.gem5.org/dist/v22-1/misc/riscv/bbl-busybox-boot-exit
 ```
 
 Running the simulation
@@ -87,7 +87,7 @@
 directory):
 
 ```sh
-wget http://dist.gem5.org/dist/v22-0/arm/aarch-sst-20211207.tar.bz2
+wget http://dist.gem5.org/dist/v22-1/arm/aarch-sst-20211207.tar.bz2
 tar -xf aarch-sst-20211207.tar.bz2
 
 # copying bootloaders