Bump extern/amrex from a65f0a5 to 7418556 (#659)

Bumps [extern/amrex](https://github.com/AMReX-Codes/amrex) from
`a65f0a5` to `7418556`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/7418556773c74827478767d2a58c9220cf5900b3"><code>7418556</code></a>
HDF5: Correctly handle writing only some components when writing
Particle (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/4">#4</a>...</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/73e46e68114cc9d0ac0f1cb8349565ea5487f4d4"><code>73e46e6</code></a>
HDF5: Correctly choose datatype of plotfile based on RD numBytes (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/4006">#4006</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/2f93525639dae966ee41e1f36f37ee6693a72ba0"><code>2f93525</code></a>
Fix L2 norms in C_util/Convergence codes (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/4009">#4009</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/463bdf493cd7b81f95832f1ab6cd1689a7b739bc"><code>463bdf4</code></a>
Match the dimensions of reqd_work_group_size to submitted nd_range (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/4002">#4002</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/27b399afb0c667585a51dcb7cf9f8bf5c257239d"><code>27b399a</code></a>
GNU Make: try nvidia-smi for CUDA arch if deviceQuery fails (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3997">#3997</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/259db7cfb99e7d1d2ab4bec9b1587fdf624a138a"><code>259db7c</code></a>
Sundials Update (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3984">#3984</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/adfc227334daa769f1a783adb2ae2253ae44d7cf"><code>adfc227</code></a>
Derive: Add MultiFab version of DeriveFunc (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3990">#3990</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/85bef47dc69bcd7f1940d62c4deae6eb8ece7dbd"><code>85bef47</code></a>
GNU Make: Add support for CUDA LTO (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3993">#3993</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/0e3e39b5ed9115401dec0a76e62ae2eeee23ab6f"><code>0e3e39b</code></a>
Bottom Solver: Keep the unconverged result if it's an improvement (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3991">#3991</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/36f111b2c9687a187229f01c04738755edf6e5e4"><code>36f111b</code></a>
Workaround std::exclusive_scan issue with old compilers (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3996">#3996</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/AMReX-Codes/amrex/compare/a65f0a5811443430e33867662c0e739942a9799b...7418556773c74827478767d2a58c9220cf5900b3">compare
view</a></li>
</ul>
</details>
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