fix(cdk/layout): decrease breakpoint upper bounds - #20866

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@tomrlq could you amend your commit to be self-describing? Something like

fix(cdk/layout): decrease breakpoint upper bounds

The previous breakpoint upper bounds use `.99` for the
fractional components of upper bounds. However, this seems
to cause browser to round up to the next pixel, creating an overlap
for these values. Changing to `.98` fixes this.

Fixes #20850

could you amend your commit to be self-describing?

I just amended the commit and force pushed.

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