chore(deps): update go toolchain directive to v1.26.3 (#187)

Co-authored-by: netic-renovate[bot] <207156494+netic-renovate[bot]@users.noreply.github.com>

Author: netic-renovate[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/neticdk/go-token-handler
 
 go 1.25.0
 
-toolchain go1.26.2
+toolchain go1.26.3
 
 require (
 	github.com/coreos/go-oidc/v3 v3.18.0