Bump version to 3.4.1

```
./scripts/bump_version.sh --version 3.4.1
```

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/doxygen/mbedtls.doxyfile b/doxygen/mbedtls.doxyfile
index 5e79743..075880c 100644
--- a/doxygen/mbedtls.doxyfile
+++ b/doxygen/mbedtls.doxyfile
@@ -1,4 +1,4 @@
-PROJECT_NAME           = "mbed TLS v3.4.0"
+PROJECT_NAME           = "mbed TLS v3.4.1"
 OUTPUT_DIRECTORY       = ../apidoc/
 FULL_PATH_NAMES        = NO
 OPTIMIZE_OUTPUT_FOR_C  = YES