ATLANTA — Georgia Gov. Brian Kemp’s latest financial report reveals his wealth has grown by more than $3 million since he took office in 2019, thanks partly to a string of real estate holdings and business investments that appreciated in value. The Republican filed paperwork Thursday that showed a net worth of roughly $8.6 million that included more than $4.6 million in various properties and a roughly $420,000 stake in a stone supply company. In his 2018 disclosure, Kemp reported a worth of $5.2 million. Kemp’s two top challengers, Republican David Perdue and Democrat Stacey Abrams, both file…