Removing go118 & 119 as per their end of support dates

Author: Nishi-1412

.github/workflows/unit.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        go: ['1.18', '1.19', '1.20', '1.21', '1.22', '1.23', '1.24']
+        go: ['1.20', '1.21', '1.22', '1.23', '1.24']
         os: [ubuntu-latest, macos-latest, windows-latest]
     steps:
     - name: Harden Runner