Bump regex-syntax from 0.7.5 to 0.8.4 (#3468)

Bumps [regex-syntax](https://github.com/rust-lang/regex) from 0.7.5 to
0.8.4.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rust-lang/regex/commit/4757b5f01a7b9b6c8d89bd63b3d1500f7e0efa9e"><code>4757b5f</code></a>
regex-syntax-0.8.4</li>
<li><a
href="https://github.com/rust-lang/regex/commit/1430b65baeebeb67b3335e26a71f251cce9964ef"><code>1430b65</code></a>
changelog: 1.10.4</li>
<li><a
href="https://github.com/rust-lang/regex/commit/1f9f9ccd393fc5342aff6db5e3d47915e87a2554"><code>1f9f9cc</code></a>
bytes: escape invalid UTF-8 bytes in debug output for Match</li>
<li><a
href="https://github.com/rust-lang/regex/commit/ab4c8d1f210a2e1011a4408476b2c708e64dcede"><code>ab4c8d1</code></a>
doc: fix duplicate phrasing typo</li>
<li><a
href="https://github.com/rust-lang/regex/commit/ddeb85eaa3bdf79d6306cc92a9d8bd89d839b5cd"><code>ddeb85e</code></a>
cli/deps: update memmap2 to 0.9</li>
<li><a
href="https://github.com/rust-lang/regex/commit/023f1c9ac117cd5ef2e45119b61b94f85d109667"><code>023f1c9</code></a>
lite: fix attribute warning about rustfmt</li>
<li><a
href="https://github.com/rust-lang/regex/commit/9c139f4fa5c64a89075749cd5e57148c8eea8c22"><code>9c139f4</code></a>
syntax: simplify <code>Hir::dot</code> constructors</li>
<li><a
href="https://github.com/rust-lang/regex/commit/b12a2761f91320bc8bf8246f88d2884a90034b5a"><code>b12a276</code></a>
syntax/utf8: avoid a spurious vector reallocation</li>
<li><a
href="https://github.com/rust-lang/regex/commit/4c565c8a636aa0e1e13dd801340ad6545fd256e9"><code>4c565c8</code></a>
doc: fix typos</li>
<li><a
href="https://github.com/rust-lang/regex/commit/66a3bca217881fe8eee9a5a898aea4ecb1eb5cf3"><code>66a3bca</code></a>
doc: remove repetitive words</li>
<li>Additional commits viewable in <a
href="https://github.com/rust-lang/regex/compare/regex-syntax-0.7.5...regex-syntax-0.8.4">compare
view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=regex-syntax&package-manager=cargo&previous-version=0.7.5&new-version=0.8.4)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't
alter it yourself. You can also trigger a rebase manually by commenting
`@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits
that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after
your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge
and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating
it. You can achieve the same result by closing it manually
- `@dependabot show <dependency name> ignore conditions` will show all
of the ignore conditions of the specified dependency
- `@dependabot ignore this major version` will close this PR and stop
Dependabot creating any more for this major version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop
Dependabot creating any more for this minor version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop
Dependabot creating any more for this dependency (unless you reopen the
PR or upgrade to it yourself)


</details>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/arrow2/Cargo.toml

@@ -58,7 +58,7 @@ num-traits = "0.2"
 orc-format = {version = "0.3.0", optional = true}
 rand = {version = "0.8", optional = true}
 regex = {version = "1.9", optional = true}
-regex-syntax = {version = "0.7", optional = true}
+regex-syntax = {version = "0.8", optional = true}
 # Arrow integration tests support
 serde = {version = "^1.0", features = ["rc", "derive"]}
 serde_derive = {version = "^1.0", optional = true}