build: test on lts versions (including 21) (#3381)

* build: test on lts versions

* build: upgrade to proguard 7.4.0

Author: iBotPeaches

.github/workflows/build.yml

@@ -69,7 +69,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ ubuntu-latest, macOS-latest, windows-latest ]
-        java: [ 8, 11, 17, 18, 19, 20 ]
+        java: [ 8, 11, 17, 21 ]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-java@v3

gradle/libs.versions.toml

@@ -6,7 +6,7 @@ commons_lang3 = "3.13.0"
 commons_text = "1.10.0"
 guava = "32.0.1-jre"
 junit = "4.13.2"
-proguard = "7.3.2"
+proguard = "7.4.0"
 shadow = "8.1.1"
 smali = "3.0.3"
 xmlpull = "1.1.4c"