Update module go.uber.org/zap to v1.20.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
go.uber.org/zap	require	minor	v1.19.1 -> v1.20.0

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Release Notes

uber-go/zap

v1.20.0

Compare Source

Enhancements:

• #​989: Add EncoderConfig.SkipLineEnding flag to disable adding newline
  characters between log statements.
• #​1039: Add EncoderConfig.NewReflectedEncoder field to customize JSON
  encoding of reflected log fields.

Bugfixes:

• #​1011: Fix inaccurate precision when encoding complex64 as JSON.
• #​554, #​1017: Close JSON namespaces opened in MarshalLogObject
  methods when the methods return.
• #​1033: Avoid panicking in Sampler core if thereafter is zero.

Other changes:

• #​1028: Drop support for Go < 1.15.

Thanks to @​psrajat, @​lruggieri, @​sammyrnycreal for their contributions to this release.

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