[chore] update dependencies (#4423)

- codeberg.org/gruf/go-ffmpreg: v0.6.10 -> v0.6.11
- github.com/spf13/cast: v1.9.2 -> v1.10.0
- github.com/spf13/viper: v1.20.1 -> v1.21.0
- golang.org/x/crypto: v0.41.0 -> v0.42.0
- golang.org/x/image: v0.30.0 -> v0.31.0

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4423
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

vendor/github.com/sourcegraph/conc/Makefile

@@ -0,0 +1,24 @@
+.DEFAULT_GOAL := help
+
+GO_BIN ?= $(shell go env GOPATH)/bin
+
+.PHONY: help
+help:
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
+
+$(GO_BIN)/golangci-lint:
+	@echo "==> Installing golangci-lint within "${GO_BIN}""
+	@go install -v github.com/golangci/golangci-lint/cmd/golangci-lint@latest
+
+.PHONY: lint
+lint: $(GO_BIN)/golangci-lint ## Run linting on Go files
+	@echo "==> Linting Go source files"
+	@golangci-lint run -v --fix -c .golangci.yml ./...
+
+.PHONY: test
+test: ## Run tests
+	go test -race -v ./... -coverprofile ./coverage.txt
+
+.PHONY: bench
+bench: ## Run benchmarks. See https://pkg.go.dev/cmd/go#hdr-Testing_flags
+	go test ./... -bench . -benchtime 5s -timeout 0 -run=XXX -cpu 1 -benchmem