chore: lower the default mempool min gas price (#2843) #2579

Job	Run time
goreleaser-check	4s
lint / golangci-lint	12s
lint / yamllint	8s
markdown-linter / markdown-link-check	1m 50s
markdown-linter / markdown-lint	8s
test / test-short	2m 36s
test / test	7m 36s
test / test-coverage	8m 7s
test / test-race	5m 8s
lint / hadolint / hadolint	7s
version_bump	3s
goreleaser	5m 46s
	31m 45s

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