Add expicit rules_shell dependency

And stop relying on it being available transitively.

Author: pgold

MODULE.bazel

@@ -13,6 +13,7 @@ bazel_dep(name = "zlib", version = "1.3.1.bcr.5")
 
 bazel_dep(name = "google_benchmark", version = "1.9.5", dev_dependency = True)
 bazel_dep(name = "googletest", version = "1.17.0.bcr.2", dev_dependency = True)
+bazel_dep(name = "rules_shell", version = "0.8.0", dev_dependency = True)
 
 # due to
 #   https://github.com/bazelbuild/bazel/issues/24426