chore: upgrade to Go 1.21 (#2333)

Closes #2321

Separately we can consider dropping the `-compat` flag usage. See
#2332 b/c I don't
think it's necessary.

.github/workflows/lint.yml

@@ -5,7 +5,7 @@ on:
   workflow_call:
 
 env:
-  GO_VERSION: '1.20'
+  GO_VERSION: '1.21'
 
 jobs:
   golangci-lint:

.github/workflows/test.yml

@@ -3,7 +3,7 @@ on:
   workflow_call:
 
 env:
-  GO_VERSION: '1.20'
+  GO_VERSION: '1.21'
 
 jobs:
   test:

Makefile

@@ -63,7 +63,7 @@ build: mod
 	@cd ./cmd/celestia-appd
 	@mkdir -p build/
 	@go build $(BUILD_FLAGS) -o build/ ./cmd/celestia-appd
-	@go mod tidy -compat=1.20
+	@go mod tidy -compat=1.21
 .PHONY: build
 
 ## install: Build and install the celestia-appd binary into the $GOPATH/bin directory.
@@ -75,7 +75,7 @@ install: go.sum
 ## mod: Update go.mod.
 mod:
 	@echo "--> Updating go.mod"
-	@go mod tidy -compat=1.20
+	@go mod tidy -compat=1.21
 .PHONY: mod
 
 ## mod-verify: Verify dependencies have expected content.
@@ -185,7 +185,7 @@ txsim-build:
 	@cd ./test/cmd/txsim
 	@mkdir -p build/
 	@go build $(BUILD_FLAGS) -o build/ ./test/cmd/txsim
-	@go mod tidy -compat=1.20
+	@go mod tidy -compat=1.21
 .PHONY: txsim-build
 
 ## txsim-build-docker: Build the tx simulator Docker image. Requires Docker.

README.md

@@ -36,7 +36,7 @@ node            |  |                               |  |
 
 ## Install
 
-1. [Install Go](https://go.dev/doc/install) 1.20
+1. [Install Go](https://go.dev/doc/install) 1.21
 1. Clone this repo
 1. Install the celestia-app CLI
 

go.mod

@@ -1,6 +1,8 @@
 module github.com/celestiaorg/celestia-app
 
-go 1.20
+go 1.21
+
+toolchain go1.21.0
 
 require (
 	github.com/celestiaorg/nmt v0.18.1