fix(deps): update dependency knex to ^0.20.15

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
knex (source)	dependencies	patch	^0.20.13 -> ^0.20.15

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Release Notes

knex/knex

v0.20.15

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Bug fixes:

• Support for .finally(..) on knex's Promise-alikes #​3800

Typings:

• Add types for .distinctOn #​3784

v0.20.14

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New features:

• CLI: adds support for asynchronous knexfile loading #​3748
• Add clearGroup method #​3771

Typings:

• Support Raw types for insert, where, update #​3730
• Add typings for MigrationSource #​3756
• Update signature of orderBy to support QueryBuilder inside array #​3757
• Add toSQL and toString to SchemaBuilder #​3758
• interface Knex and function Knex should have the same types #​3787
• Fix minor issues around typings #​3765

Test / internal changes:

• Minor test internal enhancements #​3747
• Minor improvements on the usage of fs utilities #​3749
• Split tests in groups #​3785

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