Fix tests of docker image and Update Nu LICENSE (nushell#15015)

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# Description
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- Fix docker image tests failure for [nightly
build](https://github.com/nushell/nightly/actions/runs/13150680863) and
[release
build](https://github.com/nushell/nightly/actions/runs/13156381344). I
have test them locally to make sure it works
- Update Nushell LICENSE by the way

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2019 - 2023 The Nushell Project Developers
+Copyright (c) 2019 - 2025 The Nushell Project Developers
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

docker/test_docker.nu

@@ -148,6 +148,6 @@ def "test config initialised" [] {
     let env_size = $files | where file == "env.nu" | get size | first
     let config_size = $files | where file == "config.nu" | get size | first
 
-    assert greater $env_size 1KiB
-    assert greater $config_size 1KiB
+    assert greater $env_size 300B
+    assert greater $config_size 350B
 }