Revert "Reland "Bump pub to d69493e5163553bde53c0889b7479dee02f550bf""

This reverts commit ef8aaa3.

Reason for revert: It doesn't seem to solve the flutter issue, A roll into flutter showed the same error https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8786538012879301585/+/u/run_entrypoint_dart_registrant/test_stdout

Original change's description:
> Reland "Bump pub to d69493e5163553bde53c0889b7479dee02f550bf"
>
> This is a reland of commit a06ade1
>
> Fix of flutter issue was landed here:
> flutter/flutter@3f2cca8
>
> Original change's description:
> > Bump pub to d69493e5163553bde53c0889b7479dee02f550bf
> >
> > Changes:
> > ```
> > > git log --format="%C(auto) %h %s" 048e3ad..d69493e
> >  https://dart.googlesource.com/pub.git/+/d69493e5 Don't allow non-null-safety constraints in the root pubspec (3800)
> >  https://dart.googlesource.com/pub.git/+/3514d7e7 Fail gracefully when tar file contains duplicate entries (3805)
> >  https://dart.googlesource.com/pub.git/+/0b3b8b44 Give full error even in summary mode (3804)
> >  https://dart.googlesource.com/pub.git/+/09c29722 Allow adding and removing dependency overrides (3716)
> >  https://dart.googlesource.com/pub.git/+/7184d1b5 accept 'topics' property in pubspec.yaml (3796)
> >  https://dart.googlesource.com/pub.git/+/cd106dfd Improve usage text of get (3792)
> >  https://dart.googlesource.com/pub.git/+/019d61cb Handle bad git revisions (3791)
> >  https://dart.googlesource.com/pub.git/+/e3ff7a99 Use 'pkg' and 'packages' to trigger suggestions for the pub command (3731)
> >  https://dart.googlesource.com/pub.git/+/ea24bf22 Better error when path dependency has no pubspec.yaml (3787)
> >  https://dart.googlesource.com/pub.git/+/da2a0144 Drop --use-data-isolate-strategy flag for tests (3788)
> >  https://dart.googlesource.com/pub.git/+/a565858e Improve documentation of `pub token` and subcommands (3778)
> >  https://dart.googlesource.com/pub.git/+/dd320459 Add test for publishing and consuming files with unicode characters in name (3785)
> >  https://dart.googlesource.com/pub.git/+/c4226d9f Fail tests on errors thrown by test PackageServer (3784)
> >  https://dart.googlesource.com/pub.git/+/12019939 Consider pubspec_overrides.yaml when publishing (3782)
> >  https://dart.googlesource.com/pub.git/+/d8a97497 Allow addition of tokens for insecure localhost repositories (3777)
> >
> > ```
> >
> > Diff: https://dart.googlesource.com/pub.git/+/048e3ad2b5e1b4ebe6883addbc95722be6904a7b..d69493e5163553bde53c0889b7479dee02f550bf/
> > Change-Id: I92af981e9cb6aaedfcd75a7327dfef071645306b
> > Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/285908
> > Reviewed-by: Jonas Jensen <[email protected]>
> > Commit-Queue: Sigurd Meldgaard <[email protected]>
> > Reviewed-by: William Hesse <[email protected]>
>
> Change-Id: Ieeab0b4782afa216b353b91c57bde90957ce0aff
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/288440
> Reviewed-by: William Hesse <[email protected]>
> Commit-Queue: Sigurd Meldgaard <[email protected]>

Change-Id: Ibf3e7ec9080b137672ad2b9179090e6c980c6962
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/289062
Reviewed-by: William Hesse <[email protected]>
Bot-Commit: Rubber Stamper <[email protected]>
Commit-Queue: Siva Annamalai <[email protected]>

Author: a-siva

DEPS

@@ -156,7 +156,7 @@ vars = {
   "path_rev": "24b58a2499440cc3d12d2b3c2f52b95f91ff1c0a",
   "pool_rev": "694cfd867d8d84857fc42a8d07933013f0d25305",
   "protobuf_rev": "75bc380a6e9601565606a13dee16c5ab2bf5019c",
-  "pub_rev": "d69493e5163553bde53c0889b7479dee02f550bf", # disable rev_sdk_deps.dart
+  "pub_rev": "048e3ad2b5e1b4ebe6883addbc95722be6904a7b", # disable rev_sdk_deps.dart
   "pub_semver_rev": "c0e6ea74ccfbfdb2ef54c7cd9ad31455ca8e481f",
   "shelf_rev": "9a792b49f07bd9d310d83cd103035cc60a9956af",
   "source_map_stack_trace_rev": "45ea3688b6bec1eb565c38c4e28f37b01f8a0fa9",

tools/bots/pub_integration_test.py

@@ -12,7 +12,7 @@
 
 PUBSPEC = """name: pub_integration_test
 environment:
-  sdk: '^2.19.0'
+  sdk: '>=2.10.0 <=3.0.0'
 dependencies:
   shelf:
   test: