all: Disable HTTP/2

[GermanCoding]

We are encountering performance issues and sometimes HTTP state errors when HTTP/2 is in use. Because we have no actual benefit for HTTP/2, disabling it in all SDKs seems like the most reliable solution for now.

If there is a need for HTTP/2 in the future, we may revisit this decision.

• [x] Typescript
• [x] Go
• [x] Dotnet
• [x] Python
• [x] Java
• [x] Rust
• [x] Ruby
• [x] PHP

[GermanCoding]

PRs are open