automatically fix git commit-graph-chain locks

[LuaSnip]         fetch | fatal: Unable to create '/home/jake/.local/share/nvim/lazy/LuaSnip/.git/objects/info/commit-graphs/commit-graph-chain.lock': File exists.
[LuaSnip]         fetch | 
Another git process seems to be running in this repository, e.g.
[LuaSnip]         fetch | an editor opened by 'git commit'. Please make sure all processes
[LuaSnip]         fetch | are terminated then try again. If it still fails, a git process
[LuaSnip]         fetch | may have crashed in this repository earlier:
[LuaSnip]         fetch | remove the file manually to continue.

[...]

[rainbow-delimiters.nvim] fetch | Fetching submodule test/xdg/local/share/nvim/site/pack/testing/start/yo-dawg
[rainbow-delimiters.nvim] fetch | fatal: Unable to create '/home/jake/.local/share/nvim/lazy/rainbow-delimiters.nvim/.git/objects/info/commit-graphs/commit-graph-chain.lock': File exists.
[rainbow-delimiters.nvim] fetch | 
Another git process seems to be running in this repository, e.g.
[rainbow-delimiters.nvim] fetch | an editor opened by 'git commit'. Please make sure all processes
[rainbow-delimiters.nvim] fetch | are terminated then try again. If it still fails, a git process
[rainbow-delimiters.nvim] fetch | may have crashed in this repository earlier:
[rainbow-delimiters.nvim] fetch | remove the file manually to continue.