Update dependency flatbuffers to v2.0.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flatbuffers (source)	==2.0 -> ==2.0.7

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Release Notes

google/flatbuffers (flatbuffers)

v2.0.7

Compare Source

• This is the first version with an explicit change log, so all the previous
  features will not be listed.

• Verifier now checks that buffers are at least the minimum size required to be
  a flatbuffers (12 bytes). This includes nested flatbuffers, which previously
  could be declared valid at size 0.

• Annotated binaries. Given a flatbuffer binary and a schema (or binary schema)
  one can generate an annotated flatbuffer (.afb) to describe each byte in the
  binary with schema metadata and value.

• First binary schema generator (Lua) to generate Lua code via a .bfbs file.
  This is mostly an implementation detail of flatc internals, but will be slowly
  applied to the other language generators.

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