Bump once_cell from 1.2.0 to 1.3.1

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.2.0 to 1.3.1.
- [Release notes](https://github.com/matklad/once_cell/releases)
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](https://github.com/matklad/once_cell/compare/v1.2.0...v1.3.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

crates/texlab_citeproc/Cargo.toml

@@ -16,7 +16,7 @@ fnv = "1.0.3"
 html2md = "0.2.9"
 itertools = "0.8.2"
 lalrpop-util = "0.17.2"
-once_cell = "1.2.0"
+once_cell = "1.3.1"
 regex = "1.3.3"
 serde = { version = "1.0.104", features = ["derive", "rc"] }
 serde_json = "1.0.44"

crates/texlab_completion/Cargo.toml

@@ -11,7 +11,7 @@ futures = "0.3"
 futures-boxed = { path = "../futures_boxed" }
 itertools = "0.8.2"
 log = "0.4.6"
-once_cell = "1.2.0"
+once_cell = "1.3.1"
 regex = "1.3.3"
 serde = { version = "1.0.104", features = ["derive", "rc"] }
 serde_json = "1.0.44"

crates/texlab_syntax/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2018"
 
 [dependencies]
 itertools = "0.8.2"
-once_cell = "1.2.0"
+once_cell = "1.3.1"
 path-clean = "0.1.0"
 serde = { version = "1.0.104", features = ["derive", "rc"] }
 serde_json = "1.0.44"

crates/texlab_test/Cargo.toml

@@ -11,7 +11,7 @@ copy_dir = "0.1.2"
 futures = "0.3"
 futures-boxed = { path = "../futures_boxed" }
 jsonrpc = { path = "../jsonrpc" }
-once_cell = "1.2.0"
+once_cell = "1.3.1"
 serde = { version = "1.0.104", features = ["derive", "rc"] }
 serde_json = "1.0.44"
 tempfile = "3"

crates/texlab_workspace/Cargo.toml

@@ -11,7 +11,7 @@ futures = "0.3"
 futures-boxed = { path = "../futures_boxed" }
 itertools = "0.8.2"
 log = "0.4.6"
-once_cell = "1.2.0"
+once_cell = "1.3.1"
 petgraph = "0.5.0"
 serde = { version = "1.0.104", features = ["derive", "rc"] }
 serde_json = "1.0.44"