tag-git: use the new Git for Windows snapshots URL

For almost eight years, Git for Windows' snapshots were hosted at
https://wingit.blob.core.windows.net/files/index.html, i.e. on Azure
Blobs.

As of a combination of PRs [*1*], [*2*],
snapshots are not only now built and deployed via GitHub Actions instead
of Azure Pipelines (and ARM64 artifacts are now included, too), they are
also hosted on GitHub [*3*], with the main page being hosted on GitHub
Pages [*4*].

Therefore, the original link now redirects to a new location (which is
also a lot easier to remember): http://gitforwindows.org/git-snapshots.
Let's adjust the link to link there directly.

References:
*1*: git-for-windows/git-for-windows-automation#109
*2*: git-for-windows/gfw-helper-github-app#117
*3*: https://github.com/git-for-windows/git-snapshots/releases/
*4*: https://github.com/git-for-windows/git-snapshots/commits/gh-pages

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

index.html

@@ -112,7 +112,7 @@ <h3><span class="gittext">Git for Windows SDK</span> : Contributing Code</h3>
 					<li><a href="https://github.com/git-for-windows/git" target="_blank">Repository</a></li>
 					<li><a href="http://groups.google.com/group/git-for-windows" target="_blank">Mailing List</a></li>
 					<li><a href="https://github.com/git-for-windows/git/releases/">All Releases</a></li>
-					<li><a href="https://wingit.blob.core.windows.net/files/index.html">Snapshots</a></li>
+					<li><a href="https://gitforwindows.org/git-snapshots/">Snapshots</a></li>
 					<li><a href="https://github.com/git-for-windows/build-extra/blob/master/ReleaseNotes.md#licenses">Licenses</a></li>
 				</ul>
 				<a href="index.html"><h1 class="gittext lowercase">Git for Windows</h1></a>