gitlab-ci: Update Windows builds to MSVC 19.27

.gitlab/os-windows.yml

@@ -36,7 +36,7 @@
         CMAKE_CONFIGURATION: windows_vs2019_x64_ninja
         VCVARSALL: "${VS160COMNTOOLS}\\..\\..\\VC\\Auxiliary\\Build\\vcvarsall.bat"
         VCVARSPLATFORM: "x64"
-        VCVARSVERSION: "14.26"
+        VCVARSVERSION: "14.27"
 
 ### External testing
 
@@ -47,7 +47,7 @@
         CMAKE_CONFIGURATION: windows_vs2019_x64
         CMAKE_GENERATOR: "Visual Studio 16 2019"
         CMAKE_GENERATOR_PLATFORM: "x64"
-        CMAKE_GENERATOR_TOOLSET: "v142,version=14.26"
+        CMAKE_GENERATOR_TOOLSET: "v142,version=14.27"
 
 ## Tags
 
@@ -57,7 +57,7 @@
         - windows
         - shell
         - vs2019
-        - msvc-19.25
+        - msvc-19.27
         - nonconcurrent
 
 .windows_builder_ext_tags:
@@ -66,7 +66,7 @@
         - windows
         - shell
         - vs2019
-        - msvc-19.25
+        - msvc-19.27
         - concurrent
 
 ## Windows-specific scripts