Update package charcode dependency

Updates the dependency on package charcode to to a version
of the package with language version 2.10. The package_config.json
file gave its language version as 2.10, enabling null safety,
but this was inconsistent with the package spec in charcode,
and would be overwritten by running tools/generate_package_config.

Bug: https://github.com/dart-lang/sdk/issues/43004
Change-Id: If41861485ca99a150152c72e0f0fcccc7c4780cc
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/158008
Auto-Submit: William Hesse <whesse@google.com>
Commit-Queue: William Hesse <whesse@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
diff --git a/.dart_tool/package_config.json b/.dart_tool/package_config.json
index 58a930c..10b2831 100644
--- a/.dart_tool/package_config.json
+++ b/.dart_tool/package_config.json
@@ -11,7 +11,7 @@
     "constraint, update this by running tools/generate_package_config.dart."
   ],
   "configVersion": 2,
-  "generated": "2020-08-07T16:47:24.963156",
+  "generated": "2020-08-11T10:59:54.661195",
   "generator": "tools/generate_package_config.dart",
   "packages": [
     {
@@ -142,7 +142,7 @@
       "name": "charcode",
       "rootUri": "../third_party/pkg/charcode",
       "packageUri": "lib/",
-      "languageVersion": "2.9"
+      "languageVersion": "2.10"
     },
     {
       "name": "cli_util",
diff --git a/DEPS b/DEPS
index 6a44301..4268f99 100644
--- a/DEPS
+++ b/DEPS
@@ -73,7 +73,7 @@
   "boringssl_gen_rev": "429ccb1877f7987a6f3988228bc2440e61293499",
   "boringssl_rev" : "4dfd5af70191b068aebe567b8e29ce108cee85ce",
   "browser-compat-data_tag": "v1.0.22",
-  "charcode_rev": "af1e2d59a9c383da94f99ea51dac4b93fb0626c4",
+  "charcode_rev": "4a685faba42d86ebd9d661eadd1e79d0a1c34c43",
   "chrome_rev" : "19997",
   "cli_util_tag" : "0.2.0",
   "collection_rev": "583693680fc067e34ca5b72503df25e8b80579f9",