Update dependency go to v1.25.4

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/ccremer/paperless-cli
 
 go 1.21
 
-toolchain go1.21.4
+toolchain go1.25.4
 
 require (
 	github.com/ccremer/plogr v0.7.0