[CALCITE-6872] Release Calcite 1.39.0

1. Add and curate release notes for 1.39.0
2. Update README and howto to refer to 1.39.0
3. Update .mailmap with coordinates of new contributors
4. Update copyright year in NOTICE to 2025

Author: zabetak

.mailmap

@@ -24,6 +24,8 @@ Alessandro Solimando <asolimando@apache.com>
 Alessandro Solimando <asolimando@apache.org>
 Ali Mansour <Ali.MANSOUR@murex.com>
 Amir Gajst <amir.gajst@sisense.com>
+Anton Kovalevsky <anton@narrative.io>
+Binhua Hu <18637171812@163.com>
 Botong Huang <botong.huang@alibaba-inc.com>
 Bowen Yang <bowen.yang@kyligence.io>
 Cancai Cai <2356672992@qq.com>
@@ -45,6 +47,7 @@ Dhirenda Gautam <dhirenda.gautam@datametica.com>
 Divyanshu Srivastava <divyanshu.s@datametica.com>
 Dmitry Sysolyatin <dm.sysolyatin@gmail.com>
 Dmitry Sysolyatin <dmsysolyatin@gmail.com>
+Dongsheng He <ds_hale@163.com>
 Drew Schmitt <dasch@google.com>
 Dylan Adams <dylan.adams@gmail.com>
 Evgeniy Stanilovskiy <eugen.stan@netdava.com> # aka Eugen Stan, Evgeny Stanilovsky
@@ -62,8 +65,10 @@ Forward Xu <forwardxu@apache.com>
 Forward Xu <forwardxu@apache.org> # aka XuQianJin-Stars, Qianjin Xu
 Forward Xu <x1q1j1@163.com>
 Godfrey He <godfreyhe@163.com>
+Heng Xiao <Marty@fanruan.com>
 Hequn Cheng <chenghequn@gmail.com>
 Hong Shen (沈洪) <yuling.sh@alipay.com>
+Hongyu Guo <guohongyu.7@bytedance.com>
 Hongyu Guo <macroguo@tencent.com>
 Hongze Zhang <hongzezhang@tencent.com>
 Hsuan-Yi Chu <hsuanyichu@apache.org>
@@ -85,6 +90,7 @@ Jie Cheng <18033291053@163.com>
 Jin Xing <jinxing.corey@gmail.com>
 Jin Xing <jx158167@antfin.com> # aka jx158167
 Joey Moore <jhugomoore@google.com>
+Joey Tong <joeyutong@gmail.com>
 Johannes Schulte <johannes.schulte@gmail.com>
 Julian Feinauer <j.feinauer@pragmaticminds.de>
 Julian Hyde <jhyde@apache.org>
@@ -121,6 +127,7 @@ pengzhiwei <pengzhiwei2015@icloud.com>
 Pranava B <pranava018@gmail.com>
 Praveen Kumar <praveen@dremio.com>
 Qi Yu (余启) <yuqi5@xiaomi.com>
+Qi Zhu <qzhu@cloudera.com>
 Rafay Qureshi <qureshi.rafay@gmail.com>
 Rodrigo Rueda <rorueda@gmail.com>
 Ruben Quesada Lopez <rubenql@gmail.com>
@@ -134,6 +141,7 @@ Shikha Somani <shikha.somani@servicesource.com>
 Shradha Ambekar <Shradha_Ambekar@intuit.com>
 Shuming Li <ming.moriarty@gmail.com>
 Shuo Cheng <shuo.cs@alibaba-inc.com>
+Silun Dong <SilunDong@outlook.com>
 Slim Bouguerra <slim.bouguerra@gmail.com>
 Stamatis Zampetakis <15013153+zabetak@users.noreply.github.com>
 Stamatis Zampetakis <zabetak@gmail.com>
@@ -143,6 +151,7 @@ Taras Ledkov <tledkov@gridgain.com>
 Ted Xu (少杰) <shaojie@alibaba-inc.com>
 Venki Korukanti <venki.korukanti@gmail.com>
 Venki Korukanti <venki@dremio.com>
+Viggo Chen <viggoc96@gmail.com>
 Vladimir Ozerov <ppozerov@gmail.com>
 Vova Vysotskyi <vvovyk@gmail.com>
 Wang Yanlin <1989yanlinwang@163.com>
@@ -151,18 +160,24 @@ Wang Zhao <zoovwang@tencent.com>
 Weijie Wu <wuweijie@apache.org>
 Wenhui Tang <wenhui_tang@yeah.net>
 Wenrui Meng <wenrui@singleorigin.tech>
+Xiaochen Zhou <598457447@qq.com>
+Xiaochen Zhou <chen3494269@163.com>
 Xiaogang Zhou <zhouxiaogang@shizhuang-inc.com>
 Xiong Duan <nobigogle@gmail.com>
 Xu ZhaoHui <953396112@qq.com> # aka dz, xzh
 Xurenhe <xurenhe19910131@gmail.com> # aka wojustme
 Yanjing Wang <hannerwang@tencent.com>
+Yanjing Wang <wangyanjing@kuaishou.com>
 Yeong Wei <laiyw@persistent.my>
 Yingyu Wang <yingyu.w@gmail.com>
 Yingyu Wang <yingyuwang@users.noreply.github.com>
 Yiqun Zhang <guiyanakuang@gmail.com>
 YiwenWu <yiwenwu1006@gmail.com>
 YiwenWu <yiwenwu@tencent.com>
+Yu Xu <11161569@vivo.com>
+Yu Xu <1206332514@qq.com>
 Zhe Hu <iluffzhe@163.com>
+Zhen Chen <czjourney@163.com>
 Zhen Wang <awang@marinsoftware.com>
 Zhen Wang <zinking3@gmail.com>
 Zhengqiang Duan <duanzhengqiang@apache.org>

NOTICE

@@ -1,5 +1,5 @@
 Apache Calcite
-Copyright 2012-2024 The Apache Software Foundation
+Copyright 2012-2025 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

README

@@ -1,4 +1,4 @@
-Apache Calcite release 1.38.0
+Apache Calcite release 1.39.0
 
 This is a source distribution of Apache Calcite.