ci: Update Clang in "tidy" job

This change switches to the latest IWYU 0.23, which is compatible with
Clang 19.

Fixed new "modernize-use-starts-ends-with" warnings.

The new "bugprone-use-after-move" warning in `result_tests.cpp` is a
false positive caused by a bug in Boost.Test versions < 1.87. This has
been addressed by introducing a local variable.
See upstream references:
 - Issue: https://github.com/boostorg/test/issues/343
 - Fix: https://github.com/boostorg/test/pull/348

Co-authored-by: MarcoFalke <*~=`'#}+{/-|&$^_@721217.xyz>

src/core_read.cpp

@@ -39,7 +39,7 @@ public:
             }
             mapOpNames[strName] = static_cast<opcodetype>(op);
             // Convenience: OP_ADD and just ADD are both recognized:
-            if (strName.compare(0, 3, "OP_") == 0) { // strName starts with "OP_"
+            if (strName.starts_with("OP_")) {
                 mapOpNames[strName.substr(3)] = static_cast<opcodetype>(op);
             }
         }