[Snyk] Upgrade knex from 0.15.2 to 0.21.6

[snyk-bot]

Snyk has created this PR to upgrade knex from 0.15.2 to 0.21.6.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 66 versions ahead of your current version.
• The recommended version was released a month ago, on 2020-09-27.

The recommended version fixes:

Severity	Issue	PriorityScore (*)	Exploit Maturity
	SQL Injection SNYK-JS-KNEX-471962	704/1000 Why? Has a fix available, CVSS 9.8	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Release notes

Package name: knex

• 0.21.6 - 2020-09-27
• 0.21.5 - 2020-08-17
  No content.
• 0.21.5-next2 - 2020-08-16
• 0.21.5-next1 - 2020-08-15
• 0.21.4 - 2020-08-10
• 0.21.3 - 2020-08-08
  No content.
• 0.21.2 - 2020-07-09
  No content.
• 0.21.1 - 2020-04-27
  No content.
• 0.21.0 - 2020-04-18
  No content.
• 0.20.15 - 2020-04-15
  No content.
• 0.20.14 - 2020-04-14
  No content.
• 0.20.13 - 2020-03-23
  No content.
• 0.20.12 - 2020-03-19
• 0.20.11 - 2020-03-05
• 0.20.10 - 2020-02-16
• 0.20.9 - 2020-02-08
• 0.20.8 - 2020-01-14
• 0.20.7 - 2020-01-07
• 0.20.6 - 2019-12-29
• 0.20.4 - 2019-12-07
• 0.20.3 - 2019-11-27
• 0.20.2 - 2019-11-14
• 0.20.1 - 2019-10-29
• 0.20.0 - 2019-10-25
• 0.19.5 - 2019-10-06
• 0.19.4 - 2019-09-09
• 0.19.3 - 2019-08-28
• 0.19.2 - 2019-08-17
• 0.19.1 - 2019-07-23
• 0.19.0 - 2019-07-11
• 0.18.4 - 2019-07-10
• 0.18.3 - 2019-07-04
• 0.18.2 - 2019-07-02
• 0.18.1 - 2019-06-30
• 0.18.0 - 2019-06-26
• 0.18.0-next4 - 2019-06-23
• 0.18.0-next2 - 2019-06-19
• 0.18.0-next1 - 2019-06-17
• 0.17.6 - 2019-06-13
• 0.17.5 - 2019-06-08
• 0.17.4 - 2019-06-08
• 0.17.3 - 2019-06-02
• 0.17.2 - 2019-06-01
• 0.17.1 - 2019-05-31
• 0.17.1-next - 2019-05-30
• 0.17.0 - 2019-05-28
• 0.17.0-next6 - 2019-05-27
• 0.17.0-next5 - 2019-05-22
• 0.17.0-next4 - 2019-05-19
• 0.17.0-next2 - 2019-05-16
• 0.17.0-next - 2019-05-13
• 0.16.6-oracle-fix - 2019-04-12
• 0.16.5 - 2019-04-11
• 0.16.4 - 2019-04-11
• 0.16.4-next2 - 2019-03-13
• 0.16.4-next1 - 2019-01-31
• 0.16.3 - 2018-12-19
• 0.16.2 - 2018-12-10
• 0.16.1 - 2018-12-09
• 0.16.1-next2 - 2018-12-05
• 0.16.1-next1 - 2018-12-03
• 0.16.0-next5 - 2018-11-23
• 0.16.0-next4 - 2018-11-21
• 0.16.0-next3 - 2018-09-26
• 0.16.0-next2 - 2018-09-26
• 0.16.0-next1 - 2018-09-18
• 0.15.2 - 2018-07-19

from knex GitHub release notes

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