chore: bump core to v1.15.0 (#1432)

## Overview

bumping core before cutting v0.12.0 so that we have a cat up our sleeves
:eyes:

## Checklist

- [x] New and updated code has appropriate documentation
- [x] New and updated code has new and/or updated testing
- [x] Required CI checks are passing
- [x] Visual proof for any user facing features like CLI or
documentation updates
- [ ] Linked issues closed with keywords

go.mod

@@ -186,5 +186,5 @@ require (
 replace (
 	github.com/cosmos/cosmos-sdk => github.com/celestiaorg/cosmos-sdk v1.8.0-sdk-v0.46.7
 	github.com/gogo/protobuf => github.com/regen-network/protobuf v1.3.3-alpha.regen.1
-	github.com/tendermint/tendermint => github.com/celestiaorg/celestia-core v1.14.0-tm-v0.34.23
+	github.com/tendermint/tendermint => github.com/celestiaorg/celestia-core v1.15.0-tm-v0.34.23
 )

go.sum

@@ -186,8 +186,8 @@ github.com/btcsuite/winsvc v1.0.0/go.mod h1:jsenWakMcC0zFBFurPLEAyrnc/teJEM1O46f
 github.com/bwesterb/go-ristretto v1.2.0/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
 github.com/c-bata/go-prompt v0.2.2/go.mod h1:VzqtzE2ksDBcdln8G7mk2RX9QyGjH+OVqOCSiVIqS34=
 github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
-github.com/celestiaorg/celestia-core v1.14.0-tm-v0.34.23 h1:8zE523TUe5W33/nheJ9umHF2d1q6iHQlqJfMXMTPe3k=
-github.com/celestiaorg/celestia-core v1.14.0-tm-v0.34.23/go.mod h1:fGDSg7aw2OH/Uze1zymop0x0y1kAPEO9OII2A2cb99Q=
+github.com/celestiaorg/celestia-core v1.15.0-tm-v0.34.23 h1:BHvn41IHOtvHeX1VZqO/xBFIHj93llcw9ZQfNxyVRlI=
+github.com/celestiaorg/celestia-core v1.15.0-tm-v0.34.23/go.mod h1:nL+vkAMKy/A8wWemWqMwBy4pOGWYYbboAVTEe3N5gIU=
 github.com/celestiaorg/cosmos-sdk v1.8.0-sdk-v0.46.7 h1:EADZy33ufskVIy6Rj6jbi3SOVCeYYo26zUi7iYx+QR0=
 github.com/celestiaorg/cosmos-sdk v1.8.0-sdk-v0.46.7/go.mod h1:vg3Eza9adJJ5Mdx6boz5MpZsZcTZyrfTVYZHyi2zLm4=
 github.com/celestiaorg/merkletree v0.0.0-20210714075610-a84dc3ddbbe4 h1:CJdIpo8n5MFP2MwK0gSRcOVlDlFdQJO1p+FqdxYzmvc=