Bump protoc from 3.21.4 to 3.21.5 in /fhir-parent (#3923)

* Bump protoc from 3.21.4 to 3.21.5 in /fhir-parent

Bumps [protoc](https://github.com/protocolbuffers/protobuf) from 3.21.4 to 3.21.5.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.21.4...v3.21.5)

---
updated-dependencies:
- dependency-name: com.google.protobuf:protoc
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

* bump protobuf-java too

Signed-off-by: Lee Surprenant <lmsurpre@merative.com>

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Lee Surprenant <lmsurpre@merative.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Lee Surprenant <lmsurpre@merative.com>

Author: dependabot[bot]

fhir-parent/pom.xml

@@ -494,12 +494,12 @@
             <dependency>
                 <groupId>com.google.protobuf</groupId>
                 <artifactId>protobuf-java</artifactId>
-                <version>3.21.4</version>
+                <version>3.21.5</version>
             </dependency>
             <dependency>
                 <groupId>com.google.protobuf</groupId>
                 <artifactId>protoc</artifactId>
-                <version>3.21.4</version>
+                <version>3.21.5</version>
                 <type>pom</type>
             </dependency>
             <dependency>