Updated Nim on CI

Author: ankane

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
           tar xf nim-$NIM_VERSION-linux_x64.tar.xz
           echo "/tmp/nim-$NIM_VERSION/bin" >> $GITHUB_PATH
         env:
-          NIM_VERSION: 2.2.4
+          NIM_VERSION: 2.2.6
       - uses: ankane/setup-postgres@v1
         with:
           database: pgvector_nim_test