Update mdbook version

Author: vishesh92

netlify.toml

@@ -4,7 +4,7 @@ command = "make -C docs/book build"
 publish = "docs/book/book"
 
 [build.environment]
-GO_VERSION = "1.21"
+GO_VERSION = "1.23"
 
 # Standard Netlify redirects
 [[redirects]]

versions.mk

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-MDBOOK_VERSION := v0.4.5
+MDBOOK_VERSION := v0.4.45
 GOLANG_VERSION := 1.17.6
 PLANTUML_VERSION := 1.2020.16
 GH_VERSION := 1.2.0