Bump org.kordamp.ikonli:ikonli-materialdesign2-pack from 12.3.1 to 12.4.0 (#12986)

* Bump org.kordamp.ikonli:ikonli-materialdesign2-pack

Bumps [org.kordamp.ikonli:ikonli-materialdesign2-pack](https://github.com/kordamp/ikonli) from 12.3.1 to 12.4.0.
- [Release notes](https://github.com/kordamp/ikonli/releases)
- [Changelog](https://github.com/kordamp/ikonli/blob/master/jreleaser.yml)
- [Commits](kordamp/ikonli@v12.3.1...v12.4.0)

---
updated-dependencies:
- dependency-name: org.kordamp.ikonli:ikonli-materialdesign2-pack
  dependency-version: 12.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

* fix pdf icon

https://pictogrammers.com/docs/library/mdi/releases/changelog/

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Subhramit Basu <subhramit.bb@live.in>
Co-authored-by: Siedlerchr <siedlerkiller@gmail.com>

Author: 3 people

build.gradle

@@ -236,7 +236,7 @@ dependencies {
         exclude group: 'org.openjfx'
     }
     implementation 'org.kordamp.ikonli:ikonli-javafx:12.4.0'
-    implementation 'org.kordamp.ikonli:ikonli-materialdesign2-pack:12.3.1'
+    implementation 'org.kordamp.ikonli:ikonli-materialdesign2-pack:12.4.0'
     implementation 'com.github.sialcasa.mvvmFX:mvvmfx-validation:f195849ca9' //jitpack
     implementation 'de.saxsys:mvvmfx:1.8.0'
     implementation('org.jabref:easybind:2.2.1-SNAPSHOT') {

src/main/java/org/jabref/gui/icon/IconTheme.java

@@ -176,7 +176,7 @@ public enum JabRefIcons implements JabRefIcon {
         REMOVE(MaterialDesignM.MINUS_BOX),
         REMOVE_NOBOX(MaterialDesignM.MINUS),
         FILE(MaterialDesignF.FILE_OUTLINE),
-        PDF_FILE(MaterialDesignF.FILE_PDF),
+        PDF_FILE(MaterialDesignF.FILE_PDF_BOX),
         DOI(MaterialDesignB.BARCODE_SCAN),
         DUPLICATE(MaterialDesignC.CONTENT_DUPLICATE),
         EDIT(MaterialDesignP.PENCIL),