Switch BATS submodules to upstream

Point all submodules to the latest commit as of today;
there is no release yet including the errexit support
and releases are somewhat infrequent (2 releases in 2025).

The bats-support submodule has no new commits.

Users should switch local submodules with

  git submodule deinit --all
  git submodule sync
  git submodule update --init

Signed-off-by: Jan Dubois <jan.dubois@suse.com>

Author: jandubois

.gitmodules

@@ -1,16 +1,16 @@
 [submodule "bats/bats-core"]
 	path = bats/bats-core
-	url = https://github.com/rancher-sandbox/bats-core.git
+	url = https://github.com/bats-core/bats-core.git
 	branch = master
 [submodule "bats/bats-assert"]
 	path = bats/bats-assert
-	url = https://github.com/rancher-sandbox/bats-assert.git
+	url = https://github.com/bats-core/bats-assert.git
 	branch = master
 [submodule "bats/bats-support"]
 	path = bats/bats-support
-	url = https://github.com/rancher-sandbox/bats-support.git
+	url = https://github.com/bats-core/bats-support.git
 	branch = master
 [submodule "bats/bats-file"]
 	path = bats/bats-file
-	url = https://github.com/rancher-sandbox/bats-file.git
+	url = https://github.com/bats-core/bats-file.git
 	branch = master