Prepare v13.0.0-beta.1 for release

[Shaptic]

This PR just updates the changelog and tags off a new beta version with Protocol 22 support. Please refer to the changelog for the actual changes.

[socket-security]

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[github-actions]

Size Change: +504 kB (+1.04%)

Total Size: 49 MB

Filename	Size	Change
dist/stellar-sdk-minimal.js	6.75 MB	+70.8 kB (+1.06%)
dist/stellar-sdk-minimal.min.js	5.27 MB	+55.3 kB (+1.06%)
dist/stellar-sdk-no-axios.js	6.75 MB	+70.8 kB (+1.06%)
dist/stellar-sdk-no-axios.min.js	5.27 MB	+55.3 kB (+1.06%)
dist/stellar-sdk-no-eventsource.js	7 MB	+70.8 kB (+1.02%)
dist/stellar-sdk-no-eventsource.min.js	5.48 MB	+55.3 kB (+1.02%)
dist/stellar-sdk.js	7 MB	+70.8 kB (+1.02%)
dist/stellar-sdk.min.js	5.48 MB	+55.3 kB (+1.02%)

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