build(fpm.toml.template): update to Julienne 3.1.0

Author: rouson

manifest/fpm.toml.template

@@ -9,6 +9,6 @@ copyright = "2021-2025 The Regents of the University of California, through Lawr
 assert = {git = "https://github.com/berkeleylab/assert.git", tag = "3.0.0"}
 veggies = {git = "https://gitlab.com/everythingfunctional/veggies", tag = "v1.1.3"}
 iso_varying_string = {git = "https://gitlab.com/everythingfunctional/iso_varying_string.git", tag = "v3.0.4"}
-julienne = {git = "https://github.com/berkeleylab/julienne.git", tag = "3.0.0"}
+julienne = {git = "https://github.com/berkeleylab/julienne.git", tag = "3.1.0"}
 
 [build]