Shallow clone for third party module nlohmann (hyrise#2172)

Our third party module nlohmann_json has recently deleted its test files and shrunk from ~260 MB to ~20 MB. This PR uses the shallow submodule flag to only pull the most recent version.
hyrise-mp-22-23 · Jun 22, 2020 · f8883aa · f8883aa
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diff --git a/.gitmodules b/.gitmodules
@@ -37,6 +37,7 @@
 [submodule "third_party/nlohmann_json"]
 	path = third_party/nlohmann_json
 	url = https://github.com/nlohmann/json.git
+	shallow = true
 [submodule "third_party/sql-parser"]
 	path = third_party/sql-parser
 	url = https://github.com/hyrise/sql-parser

diff --git a/third_party/nlohmann_json b/third_party/nlohmann_json