hwcontext_vulkan: initialize and require instance version 1.3

This just bumps the required loader library version (libvulkan).
All device-related features, such as video decoding, atomics, etc.
are still optional and the code deals with their loss on a local level
(e.g. the decoder or filter checks for the features it needs, not
the hwcontext).

Bumping the required version essentially packs all maintenance
extensions which correct the spec rather than requiring to enable
them individually.

configure

@@ -7040,8 +7040,8 @@ enabled crystalhd && check_lib crystalhd "stdint.h libcrystalhd/libcrystalhd_if.
          "in maintaining it."
 
 if enabled vulkan; then
-    check_pkg_config_header_only vulkan "vulkan >= 1.2.189" "vulkan/vulkan.h" "defined VK_VERSION_1_2" ||
-        check_cpp_condition vulkan "vulkan/vulkan.h" "defined(VK_VERSION_1_3) || (defined(VK_VERSION_1_2) && VK_HEADER_VERSION >= 189)"
+    check_pkg_config_header_only vulkan "vulkan >= 1.3.238" "vulkan/vulkan.h" "defined VK_VERSION_1_3" ||
+        check_cpp_condition vulkan "vulkan/vulkan.h" "defined(VK_VERSION_1_4) || (defined(VK_VERSION_1_3) && VK_HEADER_VERSION >= 238)"
 fi
 
 if enabled x86; then

libavutil/hwcontext_vulkan.c

@@ -673,7 +673,7 @@ static int create_instance(AVHWDeviceContext *ctx, AVDictionary *opts)
     VkApplicationInfo application_info = {
         .sType              = VK_STRUCTURE_TYPE_APPLICATION_INFO,
         .pEngineName        = "libavutil",
-        .apiVersion         = VK_API_VERSION_1_2,
+        .apiVersion         = VK_API_VERSION_1_3,
         .engineVersion      = VK_MAKE_VERSION(LIBAVUTIL_VERSION_MAJOR,
                                               LIBAVUTIL_VERSION_MINOR,
                                               LIBAVUTIL_VERSION_MICRO),

libavutil/hwcontext_vulkan.h

@@ -53,7 +53,7 @@ typedef struct AVVulkanDeviceContext {
     PFN_vkGetInstanceProcAddr get_proc_addr;
 
     /**
-     * Vulkan instance. Must be at least version 1.2.
+     * Vulkan instance. Must be at least version 1.3.
      */
     VkInstance inst;