Bump com.github.jnr:jnr-posix from 3.1.19 to 3.1.20

Bumps [com.github.jnr:jnr-posix](https://github.com/jnr/jnr-posix) from 3.1.19 to 3.1.20.
- [Commits](jnr/jnr-posix@jnr-posix-3.1.19...jnr-posix-3.1.20)

---
updated-dependencies:
- dependency-name: com.github.jnr:jnr-posix
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -30,7 +30,7 @@ tasks.withType(Javadoc).configureEach {
 
 dependencies {
     api 'com.github.jnr:jnr-ffi:2.2.17'
-    api 'com.github.jnr:jnr-posix:3.1.19'
+    api 'com.github.jnr:jnr-posix:3.1.20'
     api 'com.github.jnr:jnr-constants:0.10.4'
 
     testImplementation 'junit:junit:4.13.2'