3.8.5 -> 3.8.6 changelog entry (bumped version due to compatibility issue resolved in 216c3f0)

Author: softwareengineerprogrammer

CHANGELOG.rst

@@ -13,7 +13,7 @@ GEOPHIRES-X (2023-2025)
 Revenue & Cashflow Profile period output aligned with NREL convention used to calculate NPV.
 See https://github.com/NREL/GEOPHIRES-X/discussions/344
 
-3.8.5: Baseline well drilling cost curves updated to NREL's 2025 cost curve update:
+3.8.6: Baseline well drilling cost curves updated to NREL's 2025 cost curve update:
 Akindipe, D. and Witter. E. 2025. "2025 Geothermal Drilling Cost Curves Update". https://pangea.stanford.edu/ERE/db/GeoConf/papers/SGW/2025/Akindipe.pdf?t=1740084555.
 
 Intermediate and ideal correlations retain existing values from GeoVision: