Remove unnecessary MIT license header from K3sContainer (#421)

The K3sContainer implementation is not a derivative work of the
Testcontainers K3s module. While both configure K3s containers,
the implementations differ significantly:

- Different class hierarchies (KubernetesWithKubeletContainer vs GenericContainer)
- Different kubeconfig handling (custom utils vs Jackson-based)
- Different feature sets (version management, node port ranges, etc.)
- No shared code beyond standard K3s requirements

The common configuration elements (privileged mode, tmpfs, cgroup settings)
are standard K3s requirements that any K3s container implementation must use,
not copyrightable expression.

The MIT license header was overly cautious and potentially misleading about
the relationship between the two implementations.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

Author: dajudge

src/main/java/com/dajudge/kindcontainer/K3sContainer.java

@@ -1,29 +1,8 @@
 package com.dajudge.kindcontainer;
 
 /*
- * This file is loosely inspired by https://github.com/testcontainers/testcontainers-java/blob/1.16.3/modules/k3s/src/main/java/org/testcontainers/k3s/K3sContainer.java
- *
- * The MIT License (MIT)
- *
- * Copyright (c) 2015-2019 Richard North
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
+ * K3s container configuration based on standard K3s requirements
+ * (privileged mode, tmpfs, cgroup host mode).
  */
 
 import org.slf4j.Logger;