Update CI to actions/checkout@v5 per Actions complaint.

Update REUSE to REUSE.toml exception file instead of .reuse/dep5.

Author: oddhack

REUSE.toml

@@ -0,0 +1,69 @@
+version = 1
+SPDX-PackageName = "Vulkan-Docs"
+SPDX-PackageDownloadLocation = "https://github.com/KhronosGroup/Vulkan-Docs"
+
+[[annotations]]
+path = ["images/**.svg", "config/chunkindex/custom.patch", "config/CI/**", "config/**/docinfo-header.html", "build_tests/expectations/**", "build_tests/images/**.svg", "images/proposals/**.svg"]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2015-2026 The Khronos Group Inc."
+SPDX-License-Identifier = "CC-BY-4.0"
+
+[[annotations]]
+path = "katex/**"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2013-2019 Khan Academy and other contributors"
+SPDX-License-Identifier = "MIT"
+
+[[annotations]]
+path = "config/chunkindex/lunr.js"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2019 Oliver Nightingale"
+SPDX-License-Identifier = "MIT"
+
+[[annotations]]
+path = "config/optimize-pdf"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2014-2016 OpenDevise Inc. and the Asciidoctor Project"
+SPDX-License-Identifier = "MIT"
+
+[[annotations]]
+path = "config/khronos.css"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2013 Dan Allen"
+SPDX-License-Identifier = "MIT"
+
+[[annotations]]
+path = "config/fonts/**"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2019 M+ Fonts Project"
+SPDX-License-Identifier = "LicenseRef-MPLUS"
+
+[[annotations]]
+path = "scripts/htmldiff/htmldiff.pl"
+precedence = "aggregate"
+SPDX-FileCopyrightText = ["1998-2006 MACS, Inc.", "2007 SiSco, Inc."]
+SPDX-License-Identifier = "MIT"
+
+[[annotations]]
+path = ["**.json", "scripts/vuidCounts.py", "config/chunkindex/addscript.**"]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2020-2026 The Khronos Group Inc."
+SPDX-License-Identifier = "Apache-2.0"
+
+[[annotations]]
+path = "config/copyright-spec.adoc"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2014-2026 The Khronos Group Inc"
+SPDX-License-Identifier = "LicenseRef-KhronosSpecCopyright"
+
+[[annotations]]
+path = "scripts/asciidoctor-chunker/**"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2021 Wataru Shito (@waterloo_jp)"
+SPDX-License-Identifier = "MIT"
+
+[[annotations]]
+path = ".gitlab/merge_request_templates/extensiontemplate.md"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2026 The Khronos Group Inc"
+SPDX-License-Identifier = "CC-BY-4.0"