feat: add Splunk 9.2 to the matrix (#166)

Adding Splunk 9.2 to the matrix. Also updating `LATEST` and `OLDEST`.
Test runs: 

https://github.com/splunk/addonfactory-ucc-generator/actions/runs/9584163593

action.yml

@@ -3,4 +3,4 @@ name: "Add on factory test matrix"
 description: "This tool automates the selection matrix dimensions"
 runs:
   using: "docker"
-  image: docker://ghcr.io/splunk/addonfactory-test-matrix-action/addonfactory-test-matrix-action:v2.0.1
+  image: Dockerfile

config/splunk_matrix.conf

@@ -1,6 +1,16 @@
 [GENERAL]
-LATEST = 9.1
-OLDEST = 8.2
+LATEST = 9.2
+OLDEST = 9.1
+
+[9.2]
+VERSION = 9.2.0
+BUILD = 1fff88043d5f
+SUPPORTED = 2026-01-31
+PYTHON3 = true
+PYTHON2 = false
+SWC = true
+METRICS_MULTI = true
+INPUT_LOOKUP = true
 
 [9.1]
 VERSION = 9.1.3