Swap from libssl3 to libssl3t64 in Trixie builds (#531)

On architectures that didn't undergo the time64 transition in Trixie, this is resolved automatically by APT via `Provides:`, but others fail in the following way:

```console
+ apt-get install -y --no-install-recommends libodbc2 libssl3 libsctp1
Reading package lists...
Building dependency tree...
Reading state information...
Package libssl3 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  openssl-provider-legacy libssl3t64

E: Package 'libssl3' has no installation candidate
```

Author: tianon

28/slim/Dockerfile

@@ -19,7 +19,7 @@ RUN set -xe \
 	&& echo "$OTP_DOWNLOAD_SHA256  otp-src.tar.gz" | sha256sum -c - \
 	&& runtimeDeps=' \
 		libodbc2 \
-		libssl3 \
+		libssl3t64 \
 		libsctp1 \
 	' \
 	&& buildDeps=' \

29/slim/Dockerfile

@@ -19,7 +19,7 @@ RUN set -xe \
 	&& echo "$OTP_DOWNLOAD_SHA256  otp-src.tar.gz" | sha256sum -c - \
 	&& runtimeDeps=' \
 		libodbc2 \
-		libssl3 \
+		libssl3t64 \
 		libsctp1 \
 	' \
 	&& buildDeps=' \