Replace INFINITY by std::numeric_limits.

[bangerth]

No description provided.

[codecov]

Codecov Report

Merging #363 (6ab538b) into main (462d2a3) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #363   +/-   ##
=======================================
  Coverage   98.85%   98.85%           
=======================================
  Files          77       77           
  Lines        4472     4472           
=======================================
  Hits         4421     4421           
  Misses         51       51           

Impacted Files	Coverage Δ
source/features/fault.cc	99.17% <100.00%> (ø)
source/features/subducting_plate.cc	99.17% <100.00%> (ø)
source/utilities.cc	98.64% <100.00%> (ø)

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[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	1.348 ± 0.036 (s=332)	1.352 ± 0.036 (s=337)	-0.3% .. +1.0%
Slab interpolation curved simple none	1.307 ± 0.027 (s=350)	1.310 ± 0.029 (s=340)	-0.3% .. +0.8%
Spherical slab interpolation simple none	1.586 ± 0.075 (s=276)	1.587 ± 0.072 (s=294)	-1.2% .. +1.4%
Slab interpolation simple curved CMS	2.205 ± 0.026 (s=201)	2.199 ± 0.023 (s=210)	-0.6% .. +0.1%
Spherical slab interpolation simple CMS	3.063 ± 0.057 (s=161)	3.067 ± 0.063 (s=135)	-0.6% .. +0.9%
Spherical fault interpolation simple none	1.758 ± 0.022 (s=250)	1.757 ± 0.021 (s=265)	-0.4% .. +0.3%

[MFraters]

As discussed in #331, this a better way of setting infinity. Thanks!