Widen complex ranges for pub manager

[rarkins]

Discussed in #33055

^{Originally posted by davidmartos96 December 12, 2024}

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On Dart projects, when the SDK version is specified as a range, renovate uses the replace npm versioning strategy, which strips the lower bound, which Dart requires.

Reproduction: https://github.com/davidmartos96/dart_renovatebot_bug

The range sdk: ">=3.4.0 <3.6.0" turns into sdk: <3.6.1, but that will fail when resolving the dependencies with dart pub get with the following error:

Command failed: dart pub get --no-precompile
pubspec.yaml has no lower-bound SDK constraint.
You should edit pubspec.yaml to contain an SDK constraint:

environment:
  sdk: '^3.6.0'

See https://dart.dev/go/sdk-constraint

Possible solutions:

• Use the carer syntax when in Dart and using the replace strategy
• Change the strategy to widen when resolving the sdk version

Logs (if relevant)

Logs

  {
            "currentValue": ">=3.4.0 <3.6.0",
            "currentVersion": "3.5.4",
            "datasource": "dart-version",
            "depName": "dart",
            "homepage": "https://dart.dev/",
            "isSingleVersion": false,
            "packageName": "dart",
            "registryUrl": "https://storage.googleapis.com",
            "sourceUrl": "https://github.com/dart-lang/sdk",
            "versioning": "npm",
            "warnings": [],
            "updates": [
              {
                "bucket": "non-major",
                "newVersion": "3.6.0",
                "newValue": "<3.6.1",
                "newMajor": 3,
                "newMinor": 6,
                "newPatch": 0,
                "updateType": "minor",
                "isRange": true,
                "branchName": "renovate/dart-3.x"
              }
            ]
          }
        ],
        "packageFile": "pubspec.yaml"
      }
    ]
  }

This line of config should not be necessary: https://github.com/renovate-reproductions/33055/blob/849c93bc3ddba5fc3bc51976c2174713478863e6/renovate.json#L6