fixup! release: create initial Windows installer build workflow

Switch from `windows-2019` to `windows-2022` as the former has been
retired: actions/runner-images#12045.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

.github/workflows/build-git-installers.yml

@@ -65,7 +65,7 @@ jobs:
             artifact: pkg-x86_64
             toolchain: x86_64
             mingwprefix: mingw64
-            runner: windows-2019
+            runner: windows-2022
           - name: aarch64
             artifact: pkg-aarch64
             toolchain: clang-aarch64
@@ -192,7 +192,7 @@ jobs:
             artifact: pkg-x86_64
             toolchain: x86_64
             mingwprefix: mingw64
-            runner: windows-2019
+            runner: windows-2022
           - name: aarch64
             artifact: pkg-aarch64
             toolchain: clang-aarch64