fix(deps): update renovate/renovate docker tag to v29.28.2

This MR contains the following updates:

Package	Update	Change
renovate/renovate	patch	29.28.0 -> 29.28.2

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Release Notes

renovatebot/renovate

v29.28.2

29.28.2 (2021-11-29)

Bug Fixes

• modify regex to be re2 compatbile (#​12778) (ee2e155)

Miscellaneous Chores

• deps: update actions/setup-java action to v2.4.0 (#​12883) (6b803a2)

v29.28.1

29.28.1 (2021-11-29)

Documentation

• add example of using matchCurrentVersion with a SemVer range (#​12594) (dbca35b)

Code Refactoring

• typescript: Use include/exclude sets for strict tsconfig (#​12886) (2c12ff1)
• util/cache: Enable strict nulls (#​12887) (52b2bdb)

Miscellaneous Chores

• deps: update actions/setup-node action to v2.5.0 (#​12884) (34605f4)
• deps: update dependency eslint to v8.3.0 (#​12889) (fc2f6da)

Build System

• deps: update dependency slugify to v1.6.3 (#​12888) (7fc43c7)

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