[RELEASE] React Native SDK v2.12.3

[marco-saia-datadog]

What does this PR do?

Prepares the v2.12.3 release.

What's Changed

• [CHORE] Improve core package iOS podspec compatibility by @marco-saia-datadog in [CHORE] Improve core package iOS podspec compatibility #1002
• [FIX] Span nesting on iOS by @sbarrio in Fix span nesting on iOS #984
• [FIX] iOS build errors on RN 0.72, 0.73, 0.74 and 0.75 (newarch) by @marco-saia-datadog in [FIX] iOS build errors on RN 0.72, 0.73, 0.74 and 0.75 (newarch) #1005
• [ANDROID] Specify locale for string case conversions by @marco-saia-datadog in [ANDROID] Specify locale for string case conversions #1009
• [CHORE] Force resolution of Axios to 1.12.0 by @sbarrio in [CHORE] Force resolution of Axios to 1.12.0 #1003
• [Benchmarks] Set benchmark app to use new architecture by default by @sbarrio in [Benchmarks] Set benchmark app to use new architecture by default #997
• [CHORE] Add Github publish action by @sbarrio in [CHORE] Add Github publish action #1004
• RUM-11847 [RN 0.82] Full support for React Native 0.82+ by @marco-saia-datadog in [RUM-11847] [RN 0.82] Full support for React Native 0.82+ #1011

Full Changelog: 2.12.2...marcosaia/release-v2.12.3