Fix deprecated usage of ERB.new

[chhtz]

Under Ubuntu 20.04 this fixes deprecation warnings:

/opt/workspace/tools/orogen/lib/orogen/gen/templates.rb:54: warning: Passing safe_level with the 2nd argument of ERB.new is deprecated. Do not use it, and specify other arguments as keyword arguments.
/opt/workspace/tools/orogen/lib/orogen/gen/templates.rb:54: warning: Passing trim_mode with the 3rd argument of ERB.new is deprecated. Use keyword argument like ERB.new(str, trim_mode: ...) instead.
/opt/workspace/tools/orogen/lib/orogen/gen/templates.rb:54: warning: Passing eoutvar with the 4th argument of ERB.new is deprecated. Use keyword argument like ERB.new(str, eoutvar: ...) instead.
/opt/workspace/tools/orogen/lib/orogen/gen/templates.rb:54: warning: Passing safe_level with the 2nd argument of ERB.new is deprecated. Do not use it, and specify other arguments as keyword arguments.

For Ubuntu 24.04 without this change, orogen recently ceased to work.

[chhtz]

I see, this is also part of https://github.com/rock-core/tools-orogen/pull/24/files#diff-cece380362aad64378ea51e2369b144289bc56119ef2977d35e4bcef28563d79L54
So feel free to close this (preferably after merging #24)

[jhonasiv]

@doudou anything holding up the merge of #24? If so, then I think this could be merged

[chhtz]

@doudou anything holding up the merge of #24? If so, then I think this could be merged

Merging this will conflict with merging #24 later. If something is blocking #24 I could cherry-pick the relevant commits.
I did not extensively test #24, I think I had some problems on Ubuntu 24.04 (I also needed to merge in changes for Qt5 compatibility, which may have caused issues), but I'd need to test this again.