Bump netty4_version from 4.1.107.Final to 4.1.108.Final (apache#13988)

Bumps `netty4_version` from 4.1.107.Final to 4.1.108.Final.

Updates `io.netty:netty-all` from 4.1.107.Final to 4.1.108.Final
- [Commits](netty/netty@netty-4.1.107.Final...netty-4.1.108.Final)

Updates `io.netty:netty-bom` from 4.1.107.Final to 4.1.108.Final
- [Commits](netty/netty@netty-4.1.107.Final...netty-4.1.108.Final)

---
updated-dependencies:
- dependency-name: io.netty:netty-all
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: io.netty:netty-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

dubbo-dependencies-bom/pom.xml

@@ -95,7 +95,7 @@
     <javassist_version>3.30.2-GA</javassist_version>
     <bytebuddy.version>1.14.12</bytebuddy.version>
     <netty_version>3.2.10.Final</netty_version>
-    <netty4_version>4.1.107.Final</netty4_version>
+    <netty4_version>4.1.108.Final</netty4_version>
     <httpclient_version>4.5.14</httpclient_version>
     <httpcore_version>4.4.16</httpcore_version>
     <fastjson_version>1.2.83</fastjson_version>