Item: PCIeSlot: Add V6.0 to Generations enum

The PCIe specification for Generation 6 has been released at [1].
Add this version to Generations enum.

[1] https://members.pcisig.com/wg/PCI-SIG/document/previewpdf/21847

Change-Id: Ifd30af0336204d43e84032624aa82919ca9d87be
Signed-off-by: Thang Tran <thuutran@amperecomputing.com>
diff --git a/yaml/xyz/openbmc_project/Inventory/Item/PCIeSlot.interface.yaml b/yaml/xyz/openbmc_project/Inventory/Item/PCIeSlot.interface.yaml
index 4ed5a58..273912c 100644
--- a/yaml/xyz/openbmc_project/Inventory/Item/PCIeSlot.interface.yaml
+++ b/yaml/xyz/openbmc_project/Inventory/Item/PCIeSlot.interface.yaml
@@ -50,6 +50,10 @@
             description: >
                 PCIe v5.0 slot
 
+          - name: "Gen6"
+            description: >
+                PCIe v6.0 slot
+
           - name: "Unknown"
             description: >
                 Version of the PCIe slot is unknown