Upgrading absl submodule, in the hope this will make Windows RBE work.

bazel/grpc_deps.bzl

@@ -172,9 +172,9 @@ def grpc_deps():
     if "com_google_absl" not in native.existing_rules():
         http_archive(
             name = "com_google_absl",
-            sha256 = "7ddf863ddced6fa5bf7304103f9c7aa619c20a2fcf84475512c8d3834b9d14fa",
-            strip_prefix = "abseil-cpp-61c9bf3e3e1c28a4aa6d7f1be4b37fd473bb5529",
-            url = "https://github.com/abseil/abseil-cpp/archive/61c9bf3e3e1c28a4aa6d7f1be4b37fd473bb5529.tar.gz",
+            sha256 = "fd4edc10767c28b23bf9f41114c6bcd9625c165a31baa0e6939f01058029a912",
+            strip_prefix = "abseil-cpp-74d91756c11bc22f9b0108b94da9326f7f9e376f",
+            url = "https://github.com/abseil/abseil-cpp/archive/74d91756c11bc22f9b0108b94da9326f7f9e376f.tar.gz",
         )
 
     if "bazel_toolchains" not in native.existing_rules():

third_party/abseil-cpp

@@ -1 +1 @@
-Subproject commit cc4bed2d74f7c8717e31f9579214ab52a9c9c610
+Subproject commit 74d91756c11bc22f9b0108b94da9326f7f9e376f

tools/run_tests/sanity/check_submodules.sh

@@ -26,7 +26,7 @@ want_submodules=$(mktemp /tmp/submXXXXXX)
 
 git submodule | awk '{ print $1 }' | sort > "$submodules"
 cat << EOF | awk '{ print $1 }' | sort > "$want_submodules"
- cc4bed2d74f7c8717e31f9579214ab52a9c9c610 third_party/abseil-cpp (cc4bed2)
+ 74d91756c11bc22f9b0108b94da9326f7f9e376f third_party/abseil-cpp (74d9175)
  e776aa0275e293707b6a0901e0e8d8a8a3679508 third_party/benchmark (v1.2.0)
  73594cde8c9a52a102c4341c244c833aa61b9c06 third_party/bloaty (remotes/origin/wide-14-g73594cd)
  b29b21a81b32ec273f118f589f46d56ad3332420 third_party/boringssl (remotes/origin/chromium-stable)