chore(deps): bump @grpc/proto-loader from 0.7.13 to 0.7.15#48

Bumps [@grpc/proto-loader](https://github.com/grpc/grpc-node) from 0.7.13 to 0.7.15. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/grpc/grpc-node/releases"><code>@​grpc/proto-loader</code>'s releases</a>.</em></p> <blockquote> <h2><code>@​grpc/proto-loader</code> 0.7.15</h2> <ul> <li>Apply <code>targetFileExtension</code> option to root files (<a href="https://redirect.github.com/grpc/grpc-node/issues/2946">#2946</a>)</li> </ul> <h2><code>@​grpc/proto-loader</code> 0.7.14</h2> <ul> <li>Add code generator options to specify file extensions (<a href="https://redirect.github.com/grpc/grpc-node/issues/2912">#2912</a>)</li> <li>Declare oneof specifier field as optional in generated code (<a href="https://redirect.github.com/grpc/grpc-node/issues/2911">#2911</a>)</li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/grpc/grpc-node/commit/537b32f1161d4df6701972bf790f64b246e0d08a"><code>537b32f</code></a> Merge pull request <a href="https://redirect.github.com/grpc/grpc-node/issues/2946">#2946</a> from murgatroid99/proto-loader_root_file_extension</li> <li><a href="https://github.com/grpc/grpc-node/commit/7905a76494008c513e11d7c7fd0ec33536ebdd34"><code>7905a76</code></a> proto-loader: Apply targetFileExtension to root files</li> <li><a href="https://github.com/grpc/grpc-node/commit/c2b914d4fd085679f7b48fae5356c5e7702b4a34"><code>c2b914d</code></a> Merge pull request <a href="https://redirect.github.com/grpc/grpc-node/issues/2944">#2944</a> from murgatroid99/proto-loader_0.7.14</li> <li><a href="https://github.com/grpc/grpc-node/commit/38e00726f416cbeb9835d7395f1b6f94059361e9"><code>38e0072</code></a> proto-loader: Bump to 0.7.14</li> <li><a href="https://github.com/grpc/grpc-node/commit/af53efcb8585ac97127eec816534a54c97023c17"><code>af53efc</code></a> Merge pull request <a href="https://redirect.github.com/grpc/grpc-node/issues/2939">#2939</a> from murgatroid99/grpc-js-xds_rbac_engine</li> <li><a href="https://github.com/grpc/grpc-node/commit/2e39783b36a2b56f4dfd5cc3da3fc96c05cf8c89"><code>2e39783</code></a> grpc-js-xds: Implement RBAC engine</li> <li><a href="https://github.com/grpc/grpc-node/commit/6f81b4ef9b3408a84f49b8beb27aa7b5e50900bc"><code>6f81b4e</code></a> Merge pull request <a href="https://redirect.github.com/grpc/grpc-node/issues/2935">#2935</a> from murgatroid99/grpc-js-xds_server_http_filters</li> <li><a href="https://github.com/grpc/grpc-node/commit/ff679ae473469c4d7b5ffe0230a3db33b2416099"><code>ff679ae</code></a> grpc-js-xds: Add support for server http filters</li> <li><a href="https://github.com/grpc/grpc-node/commit/c4580fa80b4133ac8ea61b55bdea99485412828b"><code>c4580fa</code></a> Merge pull request <a href="https://redirect.github.com/grpc/grpc-node/issues/2929">#2929</a> from murgatroid99/grpc-js-xds_dependency_manager_wat...</li> <li><a href="https://github.com/grpc/grpc-node/commit/4a0f4cf5c8cec14867974bfc9e4e2a3027abba15"><code>4a0f4cf</code></a> Merge branch 'master' into grpc-js-xds_dependency_manager_watcher_updates</li> <li>Additional commits viewable in <a href="https://github.com/grpc/grpc-node/compare/@grpc/[email protected]...@grpc/[email protected]">compare view</a></li> </ul> </details> <br /> [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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