graph/db: fetch policy version in cache paginated query

The ListChannelsWithPoliciesForCachePaginated query was missing the
policy version column, causing extractChannelPolicies to hardcode
lnwire.GossipVersion1 for that row type. Add cp1.version and
cp2.version to the query and use the fetched values instead.

sqldb/sqlc/graph.sql.go

@@ -3334,6 +3334,7 @@ SELECT
     n2.pub_key AS node2_pubkey,
 
     -- Node 1 policy
+    cp1.version AS policy1_version,
     cp1.timelock AS policy_1_timelock,
     cp1.fee_ppm AS policy_1_fee_ppm,
     cp1.base_fee_msat AS policy_1_base_fee_msat,
@@ -3348,6 +3349,7 @@ SELECT
     cp1.disable_flags AS policy1_disable_flags,
 
     -- Node 2 policy
+    cp2.version AS policy2_version,
     cp2.timelock AS policy_2_timelock,
     cp2.fee_ppm AS policy_2_fee_ppm,
     cp2.base_fee_msat AS policy_2_base_fee_msat,
@@ -3385,6 +3387,7 @@ type ListChannelsWithPoliciesForCachePaginatedRow struct {
 	Capacity                       sql.NullInt64
 	Node1Pubkey                    []byte
 	Node2Pubkey                    []byte
+	Policy1Version                 sql.NullInt16
 	Policy1Timelock                sql.NullInt32
 	Policy1FeePpm                  sql.NullInt64
 	Policy1BaseFeeMsat             sql.NullInt64
@@ -3397,6 +3400,7 @@ type ListChannelsWithPoliciesForCachePaginatedRow struct {
 	Policy1ChannelFlags            sql.NullInt16
 	Policy1BlockHeight             sql.NullInt64
 	Policy1DisableFlags            sql.NullInt16
+	Policy2Version                 sql.NullInt16
 	Policy2Timelock                sql.NullInt32
 	Policy2FeePpm                  sql.NullInt64
 	Policy2BaseFeeMsat             sql.NullInt64
@@ -3426,6 +3430,7 @@ func (q *Queries) ListChannelsWithPoliciesForCachePaginated(ctx context.Context,
 			&i.Capacity,
 			&i.Node1Pubkey,
 			&i.Node2Pubkey,
+			&i.Policy1Version,
 			&i.Policy1Timelock,
 			&i.Policy1FeePpm,
 			&i.Policy1BaseFeeMsat,
@@ -3438,6 +3443,7 @@ func (q *Queries) ListChannelsWithPoliciesForCachePaginated(ctx context.Context,
 			&i.Policy1ChannelFlags,
 			&i.Policy1BlockHeight,
 			&i.Policy1DisableFlags,
+			&i.Policy2Version,
 			&i.Policy2Timelock,
 			&i.Policy2FeePpm,
 			&i.Policy2BaseFeeMsat,