Upgrade soy to 2023-12-13

This new version includes support for the '&&'/'||" syntax used in
change 397298, which has already been merged. This caused many tests to
fail.

Bug: b/316621446
Change-Id: I28ebc1f3020584e69868df26c90704ab2d3984b0

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index b1bedac..422be95 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -140,8 +140,8 @@
 
 maven_jar(
     name = "soy",
-    artifact = "com.google.template:soy:2023-09-13",
-    sha1 = "b88a029df7408c58452f80d6518723f1386d69b5",
+    artifact = "com.google.template:soy:2023-12-13",
+    sha1 = "8b63495fba832cd93c8474a11812668876fee05c",
 )
 
 FLOGGER_VERS = "0.7.4"