Update GitLab UI/SVG

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/svgs (source)	dependencies	minor	1.161.0 -> 1.164.0
@gitlab/ui (source)	dependencies	minor	20.13.0 -> 20.20.0

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

gitlab-org/gitlab-svgs

v1.164.0

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[1.164.0]

• Removed icon 'issue-created'

v1.163.0

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[1.163.0]

• Added icon 'at'

v1.162.0

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[1.162.0]

• Added illustration 'empty-test-cases-lg'

gitlab-org/gitlab-ui

v20.20.0

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Bug Fixes

• GlTooltip: Pass through tooltip manual events (cf49140)

Features

• Color: Update purple 600 hex (4a2096e)

v20.19.0

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Features

• Add overflow auto mixin util (8fcd6f9)

20.18.3 (2020-09-04)

Bug Fixes

• lodash: Depend on lodash@^4.17.20 (a2d0285)

20.18.2 (2020-09-04)

Bug Fixes

• GlButton: Fix Firefox cut off text (9092ef0)

20.18.1 (2020-09-03)

Bug Fixes

• GlSearchBoxByType: hide clear icon when disabled (b65fecf)

v20.18.3

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Bug Fixes

• lodash: Depend on lodash@^4.17.20 (a2d0285)

v20.18.2

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Bug Fixes

• GlButton: Fix Firefox cut off text (9092ef0)

v20.18.1

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Bug Fixes

• GlSearchBoxByType: hide clear icon when disabled (b65fecf)

v20.18.0

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Features

• Add clearfix mixin (c5a48cd)

v20.17.0

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Features

• css: Add white-space: pre-wrap utility class (633c4cb)

v20.16.0

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Features

• GlDatepicker: Allow for empty date values (452fd9a)
• utilities: add flex and spacing utilities for lg breakpoints (36791cd)

v20.15.0

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Features

• GlInputGroupText: expose GlInputGroupText component (49dac3a)

v20.14.0

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Features

• css: Add utility mixins (54a5bb4)

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