drm_hwcomposer: CI: Bump-up clang toolchain to v15

Address new clang-tidy findings, in most cases 'misc-const-correctness'
check was addressed by adding 'const' modifier, or in some cases changed
to 'auto' (where it's better for formatting).

Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
diff --git a/utils/UEvent.h b/utils/UEvent.h
index 17b3cab..64992a1 100644
--- a/utils/UEvent.h
+++ b/utils/UEvent.h
@@ -46,7 +46,7 @@
     addr.nl_groups = UINT32_MAX;
 
     // NOLINTNEXTLINE(cppcoreguidelines-pro-type-cstyle-cast)
-    int ret = bind(fd.Get(), (struct sockaddr *)&addr, sizeof(addr));
+    const int ret = bind(fd.Get(), (struct sockaddr *)&addr, sizeof(addr));
     if (ret != 0) {
       ALOGE("Failed to bind uevent socket: errno=%i", errno);
       return {};