fix(tests): run sequential to reduce failure (#516)

Author: Conni2461

.github/workflows/default.yml

@@ -17,7 +17,7 @@ jobs:
           - os: ubuntu-22.04
             rev: v0.8.3/nvim-linux64.tar.gz
           - os: ubuntu-22.04
-            rev: v0.9.0/nvim-linux64.tar.gz
+            rev: v0.9.1/nvim-linux64.tar.gz
     steps:
       - uses: actions/checkout@v3
       - run: date +%F > todays-date

Makefile

@@ -1,6 +1,6 @@
 .PHONY: test generate_filetypes lint luarocks_upload test_luarocks_install
 test:
-	nvim --headless --noplugin -u scripts/minimal.vim -c "PlenaryBustedDirectory tests/plenary/ {minimal_init = 'tests/minimal_init.vim'}"
+	nvim --headless --noplugin -u scripts/minimal.vim -c "PlenaryBustedDirectory tests/plenary/ {minimal_init = 'tests/minimal_init.vim', sequential = true}"
 
 generate_filetypes:
 	nvim --headless -c 'luafile scripts/update_filetypes_from_github.lua' -c 'qa!'