Small patch to handle deprecated PyEval_InitThreads().  See 
https://docs.python.org/3/c-api/init.html#c.PyEval_InitThreads

```
 src/modules/app_python3/app_python3_mod.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/modules/app_python3/app_python3_mod.c 
b/src/modules/app_python3/app_python3_mod.c
index 502a6d540b..0ce93b71cd 100644
--- a/src/modules/app_python3/app_python3_mod.c
+++ b/src/modules/app_python3/app_python3_mod.c
@@ -346,7 +346,9 @@ int apy_load_script(void)
        }
 
        Py_Initialize();
+#if PY_VERSION_HEX < 0x03070000
        PyEval_InitThreads();
+#endif
        myThreadState = PyThreadState_Get();
 
        PY_GIL_ENSURE;

```

#### Build Log Messages
```
make[2]: Entering directory 
'/builddir/build/BUILD/kamailio-5.4.3/src/modules/app_python3'
gcc -fPIC -DPIC -g -funroll-loops -Wcast-align -m64 -minline-all-stringops 
-falign-loops -ftree-vectorize -fno-strict-overflow -mtune=generic -pthread 
-DKSR_PTHREAD_MUTEX_SHARED -Wall    -DNAME='"kamailio"' 
-DVERSION='"5.4.3-6.gitdbe358d2d0.fc33"' -DARCH='"x86_64"' -DOS='linux_' 
-DOS_QUOTED='"linux"' -DCOMPILER='"gcc 10.2.1"' -D__CPU_x86_64 -D__OS_linux 
-DVERSIONVAL=5004003 -DCFG_DIR='"/etc/kamailio/"' 
-DSHARE_DIR='"/usr/share/kamailio/"' -DRUN_DIR='"/run/kamailio/"' -DPKG_MALLOC 
-DSHM_MMAP -DDNS_IP_HACK -DUSE_MCAST -DUSE_TCP -DDISABLE_NAGLE 
-DHAVE_RESOLV_RES -DUSE_DNS_CACHE -DUSE_DNS_FAILOVER -DUSE_DST_BLACKLIST 
-DUSE_NAPTR -DWITH_XAVP -DMEM_JOIN_FREE -DF_MALLOC -DQ_MALLOC -DTLSF_MALLOC 
-DDBG_SR_MEMORY -DUSE_TLS -DTLS_HOOKS -DUSE_CORE_STATS -DSTATISTICS 
-DMALLOC_STATS -DUSE_SCTP -DFAST_LOCK -DADAPTIVE_WAIT 
-DADAPTIVE_WAIT_LOOPS=1024 -DCC_GCC_LIKE_ASM -DHAVE_GETHOSTBYNAME2 
-DHAVE_UNION_SEMUN -DHAVE_SCHED_YIELD -DHAVE_MSG_NOSIGNAL 
-DHAVE_MSGHDR_MSG_CONTROL -DHAVE_ALLOCA_H -DHAVE_TIMEGM 
-DHAVE_SCHED_SETSCHEDULER -DHAVE_IP_MREQN -DUSE_RAW_SOCKS -DHAVE_EPOLL 
-DHAVE_SIGIO_RT -DSIGINFO64_WORKARROUND -DUSE_FUTEX -DHAVE_SELECT  
-I/usr/include/python3.9 -I/usr/include/python3.9 -DMOD_NAME='"app_python3"' -c 
app_python3_mod.c -o app_python3_mod.o -MMD -MP
app_python3_mod.c: In function 'apy_load_script':
app_python3_mod.c:349:2: warning: 'PyEval_InitThreads' is deprecated 
[-Wdeprecated-declarations]
  349 |  PyEval_InitThreads();
      |  ^~~~~~~~~~~~~~~~~~
In file included from /usr/include/python3.9/Python.h:145,
                 from app_python3_mod.c:22:
/usr/include/python3.9/ceval.h:130:37: note: declared here
  130 | Py_DEPRECATED(3.9) PyAPI_FUNC(void) PyEval_InitThreads(void);
```

### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
version: kamailio 5.4.3-6.gitdbe358d2d0.fc33.1 (x86_64/linux) e19ae3
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, 
USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, 
DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, 
USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES, 
TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, 
BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: e19ae3 
compiled on 00:00:00 Feb  5 2021 with gcc 10.2.1
```

* **Operating System**:

```
Fedora 33 Linux 5.10.12-200.fc33.x86_64 #1 SMP Mon Feb 1 02:40:52 UTC 2021 
x86_64 x86_64 x86_64 GNU/Linux
```


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