Bump the minimum MSVC version to 2022

Per
https://github.com/google/oss-policies-info/blob/main/foundational-cxx-support-matrix.md,
we can require VS2022 or later.

Looking at notable downstreams, Envoy doesn't support Windows at all
anymore, and gRPC raised their minimum in
https://github.com/grpc/grpc/pull/37687

Update-Note: On Windows, MSVC 2022 or later is now allowed. This change
will make the vs2022 configs on CI redundant with the default ones. I'll
remove the redundant ones after this lands.

Change-Id: Ib740e091271c94e0ef8999e61a31a8e3df63f349
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/71830
Auto-Submit: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Commit-Queue: Bob Beck <bbe@google.com>
Reviewed-by: Bob Beck <bbe@google.com>

BUILDING.md

diff --git a/BUILDING.md b/BUILDING.md
index d78d283..8b6203b 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -26,7 +26,7 @@
     `CMAKE_ASM_NASM_COMPILER`.
 
   * Compilers for C11 and C++14, or later, are required. On Windows, MSVC from
-    Visual Studio 2019 or later with Windows 10 SDK 2104 or later are
+    Visual Studio 2022 or later with Windows 10 SDK 2104 or later are
     supported, but using the latest versions is recommended. Recent versions of
     GCC (6.1+) and Clang should work on non-Windows platforms, and maybe on
     Windows too.

util/bot/DEPS

diff --git a/util/bot/DEPS b/util/bot/DEPS
index 441b843..1c7fa7c 100644
--- a/util/bot/DEPS
+++ b/util/bot/DEPS
@@ -25,7 +25,7 @@
   'checkout_nasm': False,
   'checkout_libcxx': False,
   'checkout_riscv64': False,
-  'vs_version': '2019',
+  'vs_version': '2022',
 
   # Run the following command to see the latest builds in CIPD:
   #  cipd describe PACKAGE_NAME -version latest

util/bot/vs_toolchain.py

diff --git a/util/bot/vs_toolchain.py b/util/bot/vs_toolchain.py
index c6dc4a4..4fb70ea 100644
--- a/util/bot/vs_toolchain.py
+++ b/util/bot/vs_toolchain.py
@@ -63,15 +63,6 @@
 def _GetDesiredVsToolchainHashes(version):
   """Load a list of SHA1s corresponding to the toolchains that we want installed
   to build with."""
-  if version == '2017':
-    # VS 2017 Update 9 (15.9.12) with 10.0.18362 SDK, 10.0.17763 version of
-    # Debuggers, and 10.0.17134 version of d3dcompiler_47.dll, with ARM64
-    # libraries.
-    return ['418b3076791776573a815eb298c8aa590307af63']
-  if version == '2019':
-    # VS 2019 16.61 with 10.0.20348.0 SDK, 10.0.22621.755 version of Debuggers,
-    # with ARM64 libraries and UWP support.
-    return ['0b5ee4d2b1']
   if version == '2022':
     # VS 2022 17.9.2 with 10.0.22621.2428 SDK with ARM64 libraries and UWP
     # support.