chg: ci: Update Clang to version 19

These Clang 19-identified issues need to be addressed first:
- [x] isc-projects/bind9!9313
- [x] isc-projects/bind9!9317
- [x] isc-projects/bind9!9316
- [x] isc-projects/bind9!9315

Validation pipelines for backports:
- [x] ~"v9.21" - https://gitlab.isc.org/isc-projects/bind9/-/pipelines/191211
- [x] ~"v9.20" - https://gitlab.isc.org/isc-projects/bind9/-/pipelines/191512
- [x] ~"v9.18" - https://gitlab.isc.org/isc-projects/bind9/-/pipelines/191904

Prereq: isc-projects/images!328

Merge branch 'mnowak/llvm-19' into 'main'

See merge request isc-projects/bind9!9296

.gitlab-ci.yml

@@ -15,7 +15,7 @@ variables:
   TEST_PARALLEL_JOBS: 4
 
   CONFIGURE: ./configure
-  CLANG_VERSION: 18
+  CLANG_VERSION: 19
   CLANG: "clang-${CLANG_VERSION}"
   SCAN_BUILD: "scan-build-${CLANG_VERSION}"
   LLVM_SYMBOLIZER: "/usr/lib/llvm-${CLANG_VERSION}/bin/llvm-symbolizer"

lib/dns/rdataslab.c

@@ -89,8 +89,7 @@ struct xrdata {
 #endif /* if DNS_RDATASET_FIXED */
 };
 
-#define peek_uint16(buffer) \
-	({ ((uint16_t) * (buffer) << 8) | *((buffer) + 1); })
+#define peek_uint16(buffer) ({ ((uint16_t)*(buffer) << 8) | *((buffer) + 1); })
 #define get_uint16(buffer)                            \
 	({                                            \
 		uint16_t __ret = peek_uint16(buffer); \