Bump ABI version

Linter warning
```
$ jt check_abi
These files have changed and might have affected the ABI:
lib/cext/include/ruby/internal/intern/load.h
src/main/c/cext/ractor.c
src/main/c/cext/truffleruby.c

Check the diff of this PR, and:
* if ABI has changed, then increment lib/cext/include/truffleruby/truffleruby-abi-version.h
* if ABI has not changed, then increment lib/cext/ABI_check.txt
```

Author: andrykonchin

lib/cext/include/truffleruby/truffleruby-abi-version.h

@@ -20,6 +20,6 @@
 // $RUBY_VERSION must be the same as TruffleRuby.LANGUAGE_VERSION.
 // $ABI_NUMBER starts at 1 and is incremented for every ABI-incompatible change.
 
-#define TRUFFLERUBY_ABI_VERSION "3.3.7.3"
+#define TRUFFLERUBY_ABI_VERSION "3.3.7.4"
 
 #endif