Update atmosphere.F90 add "action='read'" to Fortran file open statement

[climbfuji]

DESCRIPTION OF CHANGES:

Add "action='read'" to Fortran file open statement in chgres_cube's atmosphere.F90 to fix the issue described in #869.

TESTS CONDUCTED:

• Compile branch on all Tier 1 machines using Intel (Orion, Jet, Hera and WCOSS2). Done using b529162.
• Compile branch on Hera using GNU. Done using b529162.
• Compile branch in 'Debug' mode on WCOSS2. Done using b529162.
• Run unit tests locally on any Tier 1 machine. Done on Hera using b529162.
• Run relevant consistency tests locally on all Tier 1 machine. Done on Hera using b529162.

Describe any additional tests performed.

• Compiled on AWS ParallelCluster with Intel 2021.4.0, ran successfully as part of JEDI-Skylab

DEPENDENCIES:

n/a

DOCUMENTATION:

n/a

ISSUE:

Resolves #869

[climbfuji]

Wow, what did I do??? https://github.com/ufs-community/UFS_UTILS/actions/runs/6816948729/job/18539410762

[GeorgeGayno-NOAA]

Wow, what did I do??? https://github.com/ufs-community/UFS_UTILS/actions/runs/6816948729/job/18539410762

That test always breaks. I have no idea why. Rerunning it usually fixes it. Just click on the circular arrows for that test.

[climbfuji]

Wow, what did I do??? https://github.com/ufs-community/UFS_UTILS/actions/runs/6816948729/job/18539410762

That test always breaks. I have no idea why. Rerunning it usually fixes it. Just click on the circular arrows for that test.

Thanks, that worked.

[GeorgeGayno-NOAA]

Thanks @climbfuji. Will merge.

[climbfuji]

Thanks very much @GeorgeGayno-NOAA !