fix(cdk/layout): decrease breakpoint upper bounds

[tomrlq]

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

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[tomrlq]

@googlebot I signed it!

[jelbourn]

@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

[tomrlq]

could you amend your commit to be self-describing?

I just amended the commit and force pushed.

[jelbourn]

LGTM

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