delete the line of 'ccds 1.0.2 requires pyyaml==6.0.1' in requirements.txt

requirements.txt

@@ -2,5 +2,4 @@ astropy
 numpy
 redis
 toml
-csst-dfs-client@git+https://csst-tb.bao.ac.cn/code/csst-dfs/csst-dfs-client.git
-pyyaml==6.0.1
+csst-dfs-client@git+https://csst-tb.bao.ac.cn/code/csst-dfs/csst-dfs-client.git
\ No newline at end of file
\ No newline at end of file