fix(deps): update dependency isbot to v5.1.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
isbot (source)	5.1.6 -> 5.1.9

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Release Notes

omrilotan/isbot (isbot)

v5.1.9

Compare Source

• [Pattern] A more careful match for RSS substring

v5.1.8

Compare Source

• [Pattern] Recognise timestamp in user agent string - is used to generate unique strings for each request

v5.1.7

Compare Source

• [Pattern] Ignore NewsSapphire in-app browser (news app)
• [Pattern] Ignore locales with calendar in user agent

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