Roll buildtools, libc++, and abseil

Roll buildtools/ edbefcee3..6d00f8d8c (14 commits; 5 trivial rolls)

https://chromium.googlesource.com/chromium/src/buildtools.git/+log/edbefcee3d2c..6d00f8d8c5e0

Created with:
  roll-dep buildtools

Roll buildtools/third_party/libc++/trunk/ f8279b010..84fb809dd (257 commits)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxx.git/+log/f8279b01085b..84fb809dd6da

Created with:
  roll-dep buildtools/third_party/libc++/trunk

Roll third_party/abseil-cpp/ d27fcebaf..6b7d3f3b0 (18 commits; 4 trivial rolls)

https://chromium.googlesource.com/chromium/src/third_party/abseil-cpp.git/+log/d27fcebaf685..6b7d3f3b0917

Created with:
  roll-dep third_party/abseil-cpp

Change-Id: Ifc61f307ba823da3ce26868070d573e046820159
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/109291
Reviewed-by: Nigi <nigi@chromium.org>
Commit-Queue: K. Moon <kmoon@chromium.org>
diff --git a/DEPS b/DEPS
index 586813a..ae8ff39 100644
--- a/DEPS
+++ b/DEPS
@@ -34,7 +34,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling abseil
   # and whatever else without interference from each other.
-  'abseil_revision': 'd27fcebaf6851323d12ac63af3c9ac3581f7c8bd',
+  'abseil_revision': '6b7d3f3b0917593809b40c76cca3946473c82a5b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling android_ndk
   # and whatever else without interference from each other.
@@ -46,7 +46,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling buildtools
   # and whatever else without interference from each other.
-  'buildtools_revision': 'edbefcee3d2cc45cdb0c60c2b01b673f8ba728bc',
+  'buildtools_revision': '6d00f8d8c5e004b906fb8d6fbf7421da28935798',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling catapult
   # and whatever else without interference from each other.
@@ -112,7 +112,7 @@
   # and whatever else without interference from each other.
   # If you change this, also update the libc++ revision in
   # //buildtools/deps_revisions.gni.
-  'libcxx_revision': 'f8279b01085b800724f5c5629dc365b9f040dc53',
+  'libcxx_revision': '84fb809dd6dae36d556dc0bb702c6cc2ce9d4b80',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libc++abi
   # and whatever else without interference from each other.