build(deps): update go toolchain directive to v1.26.3 (#145)

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

Author: renovate[bot]

argon2/_asm/go.mod

@@ -2,7 +2,7 @@ module argon2/_asm
 
 go 1.25.0
 
-toolchain go1.26.2
+toolchain go1.26.3
 
 require (
 	github.com/go-crypt/x v0.4.14

blake2b/_asm/standard/go.mod

@@ -2,7 +2,7 @@ module blake2b/_asm
 
 go 1.25.0
 
-toolchain go1.26.2
+toolchain go1.26.3
 
 require (
 	github.com/go-crypt/x v0.4.14

go.mod

@@ -2,7 +2,7 @@ module github.com/go-crypt/x
 
 go 1.25.0
 
-toolchain go1.26.2
+toolchain go1.26.3
 
 require (
 	github.com/stretchr/testify v1.11.1