build(deps-dev): Bump dependency @ui5/linter to ^1.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@ui5/linter	^1.20.18 → ^1.21.0

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Release Notes

UI5/linter (@​ui5/linter)

v1.21.0

Compare Source

Features

• Improve UX in case no UI5 linter findings are reported (c9307dd)

Dependencies

• lockfile: In-range update of npm dependencies (1a7f734)
• lockfile: In-range update of npm dependencies (3d66155)
• lockfile: In-range update of npm dependencies (86882ea)
• lockfile: In-range update of npm dependencies (051b7f3)
• lockfile: In-range update of npm dependencies (f64934a)

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