secp256k1/ecdsa: Remove some unnecessary subslices. #5202

	name: Build and Test
	on: [push, pull_request]
	permissions:
	contents: read

	jobs:
	build:
	name: Go CI
	runs-on: ubuntu-latest
	strategy:
	matrix:
	go: ["1.20", "1.21"]
	steps:
	- name: Check out source
	uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
	- name: Set up Go
	uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
	with:
	go-version: ${{ matrix.go }}
	- name: Use lint cache
	uses: actions/cache@88522ab9f39a2ea568f7027eddc7d8d8bc9d59c8 # v3.3.1
	with:
	path: \|
	~/.cache/golangci-lint
	key: go-lint-${{ matrix.go }}-${{ hashFiles('./go.sum') }}
	restore-keys: go-lint-${{ matrix.go }}
	- name: Stablilize testdata timestamps
	run: \|
	bash ./.github/stablilize_testdata_timestamps.sh "${{ github.workspace }}"
	- name: Install Linters
	run: "go install github.com/golangci/golangci-lint/cmd/[email protected]"
	- name: Build
	run: go build ./...
	- name: Test
	run: \|
	sh ./run_tests.sh

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