Bump extern/amrex from 2ecafcf to 47347f7 (#591)

Bumps [extern/amrex](https://github.com/AMReX-Codes/amrex) from
`2ecafcf` to `47347f7`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/47347f785f5c26f1f9e65bef8e10f2d383406ef7"><code>47347f7</code></a>
Fix: Resize Component on Add (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3861">#3861</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/fe6f3de74333ccf7e4babb4832602cf6c108ce52"><code>fe6f3de</code></a>
Use less device memory when checkpointing particles (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3238">#3238</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/f264290e4d6ec13a2697d7c1112f3b3fd98505ea"><code>f264290</code></a>
<code>AddRealComp</code>/<code>AddIntComp</code>: Resize SoA (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3615">#3615</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/1be7257928eb5b553905a482e3a3d608272d22f0"><code>1be7257</code></a>
FabArray: Option to use a single contiguous chunk of memory (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3857">#3857</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/67523bb7b0d5661db6c5f53ef3818d4dea834669"><code>67523bb</code></a>
Disable AMReX_FLATTEN_FOR by default (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3860">#3860</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/41df2a586666728280b8215e47b5c28eb041d2f2"><code>41df2a5</code></a>
Curl Curl Solver: Variable beta coefficient (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3810">#3810</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/7437aa17d36ff7f7538b664c2ba49498dc001503"><code>7437aa1</code></a>
<code>MultiFab::deepCopy()</code> (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3848">#3848</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/dffdeac6f45fe7ccbe8178ff17bfe7046dbc5784"><code>dffdeac</code></a>
<code>FabArray\&lt;FAB&gt;::copy</code> Argument Name (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3856">#3856</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/8d57ebc0139705f208cb1f6f6a699ad534eb2bb8"><code>8d57ebc</code></a>
AMReX_FLATTEN_FOR (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3855">#3855</a>)</li>
<li><a
href="https://github.com/AMReX-Codes/amrex/commit/21a7a66f775b65a1e669fd1f2f068c7ac9dd1af7"><code>21a7a66</code></a>
Use Clang-Tidy 17 in GitHub CI (<a
href="https://redirect.github.com/AMReX-Codes/amrex/issues/3845">#3845</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/AMReX-Codes/amrex/compare/2ecafcff40132f56eb2b494e1a374684ff97117a...47347f785f5c26f1f9e65bef8e10f2d383406ef7">compare
view</a></li>
</ul>
</details>
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