Add Celo Sepolia to manifest filenames (#1189)

Co-authored-by: Eric Lau <ericglau@outlook.com>

Author: 0xmichalis

.changeset/fresh-rice-follow.md

@@ -0,0 +1,5 @@
+---
+'@openzeppelin/upgrades-core': patch
+---
+
+Add Celo Sepolia network to manifest file names.

packages/core/src/provider.ts

@@ -147,6 +147,7 @@ export const networkNames: { [chainId in number]?: string } = Object.freeze({
   44787: 'celo-alfajores',
   80001: 'polygon-mumbai',
   84532: 'base-sepolia',
+  11142220: 'celo-sepolia',
   11155111: 'sepolia',
   11155420: 'op-sepolia',
 });