Regres: Adjust mustpass folder for Vulkan 1.3

mustpass/master was renamed to mustpass/main:
https://github.com/KhronosGroup/VK-GL-CTS/commit/e79d062e9c071d1080e530b1c4074520ccbd1524

Bug: b/201453797
Change-Id: I78d956d131a9b0ae41699dac422086f7cc4d4fdf
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/62388
Tested-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
diff --git a/tests/regres/cmd/regres/main.go b/tests/regres/cmd/regres/main.go
index f8d8f25..2c75694 100644
--- a/tests/regres/cmd/regres/main.go
+++ b/tests/regres/cmd/regres/main.go
@@ -74,7 +74,7 @@
 	ciTestListRelPath     = "tests/regres/ci-tests.json"
 	deqpConfigRelPath     = "tests/regres/deqp.json"
 	swsTestLists          = "tests/regres/testlists"
-	deqpTestLists         = "external/vulkancts/mustpass/master"
+	deqpTestLists         = "external/vulkancts/mustpass/main"
 )
 
 var (