fix(overlay): fix typo in property name

[CaerusKaru]

BREAKING CHANGE:

• the flexibleDiemsions on CdkConnectedOverlay has been renamed to flexibleDimensions

Fixes #12925

[jelbourn]

We'll need an ng update fix for this one; @CaerusKaru want to try making one?

[CaerusKaru]

@jelbourn Sure, I can do that later today.

[CaerusKaru]

@jelbourn should be all set

[crisbeto]

@jelbourn shouldn't we also keep the old name until the next major version?

[devversion]

Please add a comment // TODO(devversion): this should be part of the V6 to V7 upgrade.

[jelbourn]

@crisbeto technically.................yeah. But nobody is using it in Google, and since it's such a blatant typo, I was going to let this one slide.

[CaerusKaru]

@jelbourn et al sorry for the commit spam. I momentarily lost my mind trying to remove a modified package-lock from the commit. I was waiting on @jelbourn's sign-off re @crisbeto's point before adding @devversion's comment. This PR should be good to go 👍

[jelbourn]

LGTM

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