Bump regex-syntax from 0.6.25 to 0.6.26

Bumps [regex-syntax](https://github.com/rust-lang/regex) from 0.6.25 to 0.6.26.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/regex/commits)

---
updated-dependencies:
- dependency-name: regex-syntax
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

plume-common/Cargo.toml

@@ -16,7 +16,7 @@ serde_derive = "1.0"
 serde_json = "1.0.81"
 shrinkwraprs = "0.3.0"
 syntect = "4.5.0"
-regex-syntax = { version = "0.6.17", default-features = false, features = ["unicode-perl"] }
+regex-syntax = { version = "0.6.26", default-features = false, features = ["unicode-perl"] }
 tracing = "0.1.34"
 askama_escape = "0.10.3"
 activitystreams = "0.7.0-alpha.18"