ci: remove java 8 build

Signed-off-by: Mariell Hoversholm <proximyst@proximyst.com>

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                java: [16, 8]
+                java: [16]
             fail-fast: true
         steps:
             - uses: actions/checkout@v2