chore: lower the default mempool min gas price #2546

Job	Run time
branch_name	1s
goreleaser-check	6s
lint / golangci-lint	1m 36s
markdown-linter / markdown-lint	8s
lint / yamllint	9s
markdown-linter / markdown-link-check	1m 54s
test / test-short	2m 37s
test / test	13m 44s
test / test-coverage	1m 7s
test / test-race	10m 12s
lint / hadolint / hadolint	7s
version_bump	0s
goreleaser	0s
	31m 41s

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