add release date for version 2.1

- fix version for the documentation.
- Set documentation authors to `The alpaka team.` since we have a full
  list of contributors to the project in the zenodo file.
  This avoids that the list is always outdated.

CI_FILTER: ^DISABLEALL

Author: psychocoderHPC

CHANGELOG.md

@@ -3,7 +3,7 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
-## [2.1.0] - 2025-12-XX
+## [2.1.0] - 2025-12-12
 
 ### Added
 
@@ -16,7 +16,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - HIP: add `ALPAKA_ARCH_AMD` definition #2577
 - Feature accessors and span conversion for buffers #2579
 - Add new backends: CUDA and HIP backends of oneAPI #2580
-- 
+
 ### Changed
 
 - Use `__builtin_assume_aligned()` to promise the correct alignment #2537
@@ -25,7 +25,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - Extend `alpaka::allocAsyncBuf()` to N-dimensional buffers on CUDA/HIP devices #2566
 - Provide `atomicInc/Dec` overloads with deduced limit values #2583
 - Specialize DevType for accelerator Tags #2584
-- 
+
 ### Fixed
 
 - Add missing `#include` for SYCL tags #2534

docs/source/conf.py

@@ -8,12 +8,12 @@
 # -- Project information -----------------------------------------------------
 
 project = "alpaka"
-copyright = "Documentation under CC-BY 4.0, Benjamin Worpitz, René Widera, Axel Huebl, Michael Bussmann"
-author = "Benjamin Worpitz, René Widera, Axel Huebl, Michael Bussmann"
+copyright = "Documentation under CC-BY 4.0."
+author = "The alpaka team."
 # The short X.Y version.
-version = "1.0.0"
+version = "2.1.0"
 # The full version, including alpha/beta/rc tags.
-release = "1.0.0-rc1"
+release = "2.1.0"
 
 # The master toctree document.
 master_doc = "index"