Update tox to use 3.8 or greater

Author: cmanallen

tox.ini

@@ -192,6 +192,10 @@ envlist =
     {py3.8,py3.12,py3.13}-openfeature-v0.7
     {py3.8,py3.12,py3.13}-openfeature-latest
 
+    # LaunchDarkly
+    {py3.8,py3.12,py3.13}-launchdarkly-v9.8.0
+    {py3.8,py3.12,py3.13}-launchdarkly-latest
+
     # OpenTelemetry (OTel)
     {py3.7,py3.9,py3.12,py3.13}-opentelemetry
 
@@ -555,6 +559,10 @@ deps =
     openfeature-v0.7: openfeature-sdk~=0.7.1
     openfeature-latest: openfeature-sdk
 
+    # LaunchDarkly
+    launchdarkly-v9.8.0: launchdarkly-server-sdk~=9.8.0
+    launchdarkly-latest: launchdarkly-server-sdk
+
     # OpenTelemetry (OTel)
     opentelemetry: opentelemetry-distro