tools: update V8 gypfiles for 12.7

Add/remove abseil files introduced by V8 12.7 update found by:

```
git diff-tree --no-commit-id --name-status 0ec8f7e -r
  | grep '^[AD].*abseil.*'
```

PR-URL: #54077
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>

Author: richardlau

tools/v8_gypfiles/v8.gyp

@@ -2251,6 +2251,7 @@
         '<(ABSEIL_ROOT)/absl/base/thread_annotations.h',
         '<(ABSEIL_ROOT)/absl/container/flat_hash_map.h',
         '<(ABSEIL_ROOT)/absl/container/fixed_array.h',
+        '<(ABSEIL_ROOT)/absl/container/hash_container_defaults.h',
         '<(ABSEIL_ROOT)/absl/container/inlined_vector.h',
         '<(ABSEIL_ROOT)/absl/container/internal/common.h',
         '<(ABSEIL_ROOT)/absl/container/internal/common_policy_traits.h',
@@ -2286,6 +2287,8 @@
         '<(ABSEIL_ROOT)/absl/debugging/internal/address_is_readable.cc',
         '<(ABSEIL_ROOT)/absl/debugging/internal/demangle.h',
         '<(ABSEIL_ROOT)/absl/debugging/internal/demangle.cc',
+        '<(ABSEIL_ROOT)/absl/debugging/internal/demangle_rust.h',
+        '<(ABSEIL_ROOT)/absl/debugging/internal/demangle_rust.cc',
         '<(ABSEIL_ROOT)/absl/debugging/internal/elf_mem_image.h',
         '<(ABSEIL_ROOT)/absl/debugging/internal/elf_mem_image.cc',
         '<(ABSEIL_ROOT)/absl/debugging/internal/stacktrace_aarch64-inl.inc',
@@ -2331,6 +2334,7 @@
         '<(ABSEIL_ROOT)/absl/profiling/internal/exponential_biased.h',
         '<(ABSEIL_ROOT)/absl/profiling/internal/exponential_biased.cc',
         '<(ABSEIL_ROOT)/absl/profiling/internal/sample_recorder.h',
+        '<(ABSEIL_ROOT)/absl/random/internal/mock_validators.h',
         '<(ABSEIL_ROOT)/absl/strings/ascii.h',
         '<(ABSEIL_ROOT)/absl/strings/ascii.cc',
         '<(ABSEIL_ROOT)/absl/strings/charconv.h',