Uses the pubspec util `computeVersionBumpEdit` that bumps the pubspec
file's `sdk:` one minor version up.
Very basic iteration through the given pubspec files to bump all of
them. We'll very likely have to refactor this as we get the pre/post
migrations involved, but I wanted to get there in small (reviewable)
steps.
Bug: https://github.com/dart-lang/sdk/issues/63268
Change-Id: I2a7abeacdc76b114dfef7888cd6db6bc8973d01a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/504381
Commit-Queue: Kallen Tu <kallentu@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Kallen Tu
efd30a2de0