fix agent-local-rpm No such file or directory (OpenSUSE)

[kometchtech]

Addressing the fact that the cache file directory for checking rpm packages in OpenSUSE does not exist and therefore the cache file cannot be created.

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[kometchtech]

+ '[' -x /bin/rpm ']'                                                                                                                  
++ date +%s                                                                                                                            
+ DATE=1745018980                                                                                                                      
+ FILE=/var/cache/librenms/agent-local-rpm                                                                                             
+ '[' '!' -e /var/cache/librenms/agent-local-rpm ']'                                                                                   
+ /bin/rpm -q --all --queryformat '%{N} %{V} %{R} %{ARCH} %{SIZE}\n'                                                                   
./rpm: line 9: /var/cache/librenms/agent-local-rpm: No such file or directory                                                          
++ stat -c %Y /var/cache/librenms/agent-local-rpm                                                                                      
stat: cannot statx '/var/cache/librenms/agent-local-rpm': No such file or directory                                                    
+ FILEMTIME=                                                                                                                           
./rpm: line 12: 1745018980-: syntax error: operand expected (error token is "-")