Prepare release 1.18.0

[justsmth]

Description of changes:

• Prepare release 1.18.0.

Changes for release

• Upstream merge 2023-11-20 by @torben-hansen in Upstream merge 2023-11-20 #1315
• Wire up s2n-bignum Ed25519 backend by @torben-hansen in Wire up s2n-bignum Ed25519 backend #1309
• Allow 0 byte read/write in SSL_{read,write}_ex by @WillChilds-Klein in Allow 0 byte read/write in SSL_{read,write}_ex #1316
• Increment session hit counter for ticket resumptions by @WillChilds-Klein in Increment session hit counter for ticket resumptions #1320
• Add back SSL_use_certificate_chain_file by @samuel40791765 in Add back SSL_use_certificate_chain_file #1312
• Log symbol name for fips scope assertion error by @torben-hansen in Log symbol name for fips scope assertion error #1321
• Add support for building with pkgconfig by @samuel40791765 in Add support for building with pkgconfig #1310
• Docker images for loongarch64, ppc64, ppc64le, and riscv64 by @justsmth in Docker images for loongarch64, ppc64, ppc64le, and riscv64 #1168
• Use mkstemp instead of tmpname when available by @samuel40791765 in Use mkstemp instead of tmpname when available #1325
• CI for Build/Testing on PPC64BE by @justsmth in CI for Build/Testing on PPC64BE #1318
• Improve decision logic for s2n-bignum implementation by @torben-hansen in Improve decision logic for s2n-bignum implementation #1323
• Add null-check for input args in SSL_{read|write}_ex by @dkostic in Add null-check for input args in SSL_{read|write}_ex #1326
• CI for PPC32 Cross build/test by @justsmth in CI for PPC32 Cross build/test #1329
• Give BIO an ex_data by @samuel40791765 in Give BIO an ex_data #1328
• Return 0 if using default proto min/max by @WillChilds-Klein in Return 0 if using default proto min/max #1322

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f3e49b0) 76.47% compared to head (0518836) 76.51%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1336      +/-   ##
==========================================
+ Coverage   76.47%   76.51%   +0.04%     
==========================================
  Files         421      421              
  Lines       71016    71016              
==========================================
+ Hits        54308    54337      +29     
+ Misses      16708    16679      -29     

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[torben-hansen]

PR depends on #1337

[torben-hansen]

merged #1337

LGTM