[web] Bump source_maps dep to v0.10.10

The current version points to a commit for v0.11.0-nullsafety.
It looks like a 0.11.0 release was never actually published. A
null safe version of the package was actually published as v0.10.10.

This also makes the version number in the package:dart2js_tools
pubspec match the version in the deps file.

Change-Id: Ibf495ed5e7388370b5cf950ed3559bf7749f42b9
Issue: https://github.com/dart-lang/sdk/issues/46617
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/215982
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Commit-Queue: Nicholas Shahan <nshahan@google.com>

.dart_tool/package_config.json

@@ -623,7 +623,7 @@
       "name": "source_maps",
       "rootUri": "../third_party/pkg/source_maps",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "source_span",

DEPS

@@ -150,7 +150,7 @@ vars = {
   "shelf_web_socket_rev": "24fb8a04befa75a94ac63a27047b231d1a22aab4",
   "source_map_stack_trace_rev": "1c3026f69d9771acf2f8c176a1ab750463309cce",
   "source_maps-0.9.4_rev": "38524",
-  "source_maps_rev": "53eb92ccfe6e64924054f83038a534b959b12b3e",
+  "source_maps_rev": "6499ee3adac8d469e2953e2e8ba4bdb4c2fbef90",
   "source_span_rev": "1be3c44045a06dff840d2ed3a13e6082d7a03a23",
   "sse_rev": "9084339389eb441d0c0518cddac211a097e78657",
   "stack_trace_rev": "6788afc61875079b71b3d1c3e65aeaa6a25cbc2f",

pkg/dart2js_tools/pubspec.yaml

@@ -6,7 +6,7 @@ description: >
   information, deobfuscation of stack-traces and minified names.
 dependencies:
   path: any
-  source_maps: ^0.10.7
+  source_maps: ^0.10.10
   source_span: any
   stack_trace: ^1.9.3
 environment: