Fix grammar of the notice that indicates a new release is available

[mdmintz]

Fix grammar of the notice that indicates a new release is available

Change A new release of pip available: to A new release of pip is available:

(Assuming this is a trivial change that does not require a news entry.)

[uranusjr]

Could you add a news fragment please? The macOS test failures seem to be unrelated, we need to fix our test setup it seems.

[mdmintz]

@uranusjr I added the news fragment.

[mdmintz]

Updated with the news fragment in the correct location

[mdmintz]

@uranusjr Now that #11532 is merged, which should fix the tests, can you trigger a rerun of the tests?

[mdmintz]

Hello @uranusjr,
Just checking to see if this PR was forgotten.
The latest notice still has the old working.

[pradyunsg]

This will be in the next release (not sure if we're going to do a bug fix).

Note that the grammar fix won't show up until the pip version you're upgrading from matches the one this releases in.