website: Fix incorrect tag in building docs

Change-Id: I8c603ecd11db8317f112ac8530f76d1cb35ee40f
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/67131
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
diff --git a/_pages/documentation/general_docs/building/index.md b/_pages/documentation/general_docs/building/index.md
index 44241e9..a87b1e0 100644
--- a/_pages/documentation/general_docs/building/index.md
+++ b/_pages/documentation/general_docs/building/index.md
@@ -121,7 +121,7 @@
 E.g., for Ubuntu 20.04 with all optional dependencies:
 
 ```
-docker pull gcr.io/gem5-test/ubuntu-20.04_all-dependencies:v22-0
+docker pull gcr.io/gem5-test/ubuntu-20.04_all-dependencies:v22-1
 ```
 
 Then, to work within this environment, we suggest using the following: