Switched to URL for json as recommended by project [skip ci]

Author: ankane

examples/cohere/CMakeLists.txt

@@ -8,7 +8,7 @@ set(CPR_USE_SYSTEM_CURL ON)
 include(FetchContent)
 
 FetchContent_Declare(cpr GIT_REPOSITORY https://github.com/libcpr/cpr.git GIT_TAG 1.14.2)
-FetchContent_Declare(json GIT_REPOSITORY https://github.com/nlohmann/json.git GIT_TAG v3.12.0)
+FetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.12.0/json.tar.xz DOWNLOAD_EXTRACT_TIMESTAMP TRUE)
 FetchContent_Declare(libpqxx GIT_REPOSITORY https://github.com/jtv/libpqxx.git GIT_TAG 8.0.0)
 FetchContent_MakeAvailable(cpr json libpqxx)
 

examples/hybrid/CMakeLists.txt

@@ -8,7 +8,7 @@ set(CPR_USE_SYSTEM_CURL ON)
 include(FetchContent)
 
 FetchContent_Declare(cpr GIT_REPOSITORY https://github.com/libcpr/cpr.git GIT_TAG 1.14.2)
-FetchContent_Declare(json GIT_REPOSITORY https://github.com/nlohmann/json.git GIT_TAG v3.12.0)
+FetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.12.0/json.tar.xz DOWNLOAD_EXTRACT_TIMESTAMP TRUE)
 FetchContent_Declare(libpqxx GIT_REPOSITORY https://github.com/jtv/libpqxx.git GIT_TAG 8.0.0)
 FetchContent_MakeAvailable(cpr json libpqxx)
 

examples/openai/CMakeLists.txt

@@ -8,7 +8,7 @@ set(CPR_USE_SYSTEM_CURL ON)
 include(FetchContent)
 
 FetchContent_Declare(cpr GIT_REPOSITORY https://github.com/libcpr/cpr.git GIT_TAG 1.14.2)
-FetchContent_Declare(json GIT_REPOSITORY https://github.com/nlohmann/json.git GIT_TAG v3.12.0)
+FetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.12.0/json.tar.xz DOWNLOAD_EXTRACT_TIMESTAMP TRUE)
 FetchContent_Declare(libpqxx GIT_REPOSITORY https://github.com/jtv/libpqxx.git GIT_TAG 8.0.0)
 FetchContent_MakeAvailable(cpr json libpqxx)
 

examples/sparse/CMakeLists.txt

@@ -8,7 +8,7 @@ set(CPR_USE_SYSTEM_CURL ON)
 include(FetchContent)
 
 FetchContent_Declare(cpr GIT_REPOSITORY https://github.com/libcpr/cpr.git GIT_TAG 1.14.2)
-FetchContent_Declare(json GIT_REPOSITORY https://github.com/nlohmann/json.git GIT_TAG v3.12.0)
+FetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.12.0/json.tar.xz DOWNLOAD_EXTRACT_TIMESTAMP TRUE)
 FetchContent_Declare(libpqxx GIT_REPOSITORY https://github.com/jtv/libpqxx.git GIT_TAG 8.0.0)
 FetchContent_MakeAvailable(cpr json libpqxx)