Update ocamlformat to 0.27.0

[smorimoto]

No description provided.

[smorimoto]

Maybe we need #1424 before merge this PR.

[coveralls]

Pull Request Test Coverage Report for Build 4658

Details

• 30 of 103 (29.13%) changed or added relevant lines in 13 files are covered.
• 3 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.004%) to 22.179%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
jsonrpc-fiber/src/jsonrpc_fiber.ml	5	6	83.33%
ocaml-lsp-server/src/compl.ml	4	5	80.0%
jsonrpc/src/jsonrpc.ml	0	2	0.0%
ocaml-lsp-server/src/code_actions/action_mark_remove_unused.ml	1	3	33.33%
ocaml-lsp-server/src/semantic_highlighting.ml	1	3	33.33%
lsp-fiber/src/rpc.ml	12	15	80.0%
ocaml-lsp-server/src/ocamlformat.ml	0	5	0.0%
ocaml-lsp-server/src/diagnostics.ml	0	9	0.0%
ocaml-lsp-server/src/dune.ml	0	16	0.0%
ocaml-lsp-server/src/ocaml_lsp_server.ml	1	33	3.03%

Files with Coverage Reduction	New Missed Lines	%
ocaml-lsp-server/src/dune.ml	1	3.02%
ocaml-lsp-server/src/diagnostics.ml	1	44.79%
ocaml-lsp-server/src/compl.ml	1	57.59%

Totals
Change from base Build 4654:	0.004%
Covered Lines:	5653
Relevant Lines:	25488

---

💛 - Coveralls

[voodoos]

Done in #1444